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159-441: Epicureanism is a system of philosophy founded around 307 BCE based upon the teachings of Epicurus , an ancient Greek philosopher . Epicurus was an atomist and materialist , following in the steps of Democritus . His materialism led him to religious skepticism and a general attack on superstition and divine intervention. Epicureanism was originally a challenge to Platonism , and its main opponent later became Stoicism . It

318-425: A linguistic therapy. According to Ludwig Wittgenstein , for instance, philosophy aims at dispelling misunderstandings to which humans are susceptible due to the confusing structure of ordinary language . Phenomenologists , such as Edmund Husserl , characterize philosophy as a "rigorous science" investigating essences . They practice a radical suspension of theoretical assumptions about reality to get back to

477-532: A Platonist conception of logic, influenced by Frege and his mentor Bolzano. —Husserl explicitly mentioned Bolzano, G. W. Leibniz and Hermann Lotze as inspirations for his position in his Logical Investigations (1900–1). Other prominent contemporary Continental philosophers interested in Platonism in a general sense include Leo Strauss , Simone Weil , and Alain Badiou . Platonism has not only influenced

636-504: A collection of writings by Epicurus that explain the values and beliefs of Ancient Epicurian philosophy. Philosophy Philosophy ('love of wisdom' in Ancient Greek ) is a systematic study of general and fundamental questions concerning topics like existence , reason , knowledge , value , mind , and language . It is a rational and critical inquiry that reflects on its own methods and assumptions. Historically, many of

795-545: A doctor diagnoses a disease based on the observed symptoms. Logic also investigates incorrect forms of reasoning. They are called fallacies and are divided into formal and informal fallacies based on whether the source of the error lies only in the form of the argument or also in its content and context. Metaphysics is the study of the most general features of reality , such as existence, objects and their properties , wholes and their parts , space and time , events , and causation . There are disagreements about

954-503: A family and in other situations it will be more beneficial to participate in politics. It is ultimately up to the Epicurean to analyse their circumstance and take whatever action befits the situation. Epicureanism rejects immortality . It believes in the soul, but suggests that the soul is mortal and material, just like the body. Epicurus rejected any possibility of an afterlife, while still contending that one need not fear death: "Death

1113-444: A great variety of methods to arrive at philosophical knowledge. They include conceptual analysis , reliance on common sense and intuitions , use of thought experiments , analysis of ordinary language , description of experience , and critical questioning . Philosophy is related to many other fields, including the sciences, mathematics , business , law , and journalism . It provides an interdisciplinary perspective and studies

1272-720: A list of the Principal Doctrines of Epicureanism; however, there are independent attestations of his ideas from his later disciples. The epic poem De rerum natura (Latin for "On the Nature of Things") by Lucretius presents the core arguments and theories of Epicureanism in one unified work. Many Epicurean texts have also been found on scrolls unearthed at the Villa of the Papyri in Herculaneum , mostly works written by

1431-625: A luxurious table, which produce a pleasant life; it is sober reasoning, searching out the grounds of every choice and avoidance, and banishing those beliefs through which the greatest tumults take possession of the soul. Epicureans had a very specific understanding of what the greatest pleasure was, and the focus of their ethics was on the avoidance of pain rather than seeking out pleasure. As evidence for this, Epicureans say that nature seems to command us to avoid pain, and they point out that all animals try to avoid pain as much as possible. Epicureanism divided pleasure into two broad categories: pleasures of

1590-448: A manner that caused the viewer to experience the color red. The atoms are not perceived individually, but rather as a continuous sensation because of how quickly they move. The Epicureans believed that all sense perceptions were true, and that errors arise in how we judge those perceptions. When we form judgments about things ( hupolepsis ), they can be verified and corrected through further sensory information. For example, if someone sees

1749-702: A metaphysical foundation of ethics. The modern period in Chinese philosophy began in the early 20th century and was shaped by the influence of and reactions to Western philosophy. The emergence of Chinese Marxism —which focused on class struggle , socialism , and communism —resulted in a significant transformation of the political landscape. Another development was the emergence of New Confucianism , which aims to modernize and rethink Confucian teachings to explore their compatibility with democratic ideals and modern science. Traditional Japanese philosophy assimilated and synthesized ideas from different traditions, including

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1908-428: A natural, but not necessary, desire that should be generally avoided. Since the political life could give rise to desires that could disturb virtue and one's peace of mind, such as a lust for power or a desire for fame, participation in politics was discouraged. Further, Epicurus sought to eliminate the fear of the gods and of death , seeing those two fears as chief causes of strife in life. When we say ... that pleasure

2067-468: A noticeable growth in the number of female philosophers , but they still remained underrepresented. Arabic–Persian philosophy arose in the early 9th century CE as a response to discussions in the Islamic theological tradition . Its classical period lasted until the 12th century CE and was strongly influenced by ancient Greek philosophers. It employed their ideas to elaborate and interpret the teachings of

2226-460: A part of intellectual history , but it also investigates questions not covered by intellectual history such as whether the theories of past philosophers are true and have remained philosophically relevant. The history of philosophy is primarily concerned with theories based on rational inquiry and argumentation; some historians understand it in a looser sense that includes myths , religious teachings , and proverbial lore. Influential traditions in

2385-616: A person's mind through sensory input over time. When the word that relates to the preconception is used, these preconceptions are summoned up by the mind into the person's thoughts. It is through our preconceptions that we are able to make judgments about the things that we perceive. Preconceptions were also used by Epicureans to avoid the paradox proposed by Plato in the Meno regarding learning. Plato argues that learning requires us to already have knowledge of what we are learning, or else we would be unable to recognize when we had successfully learned

2544-579: A renewed interest in Platonic thought, including more interest in Plato himself. In 16th-, 17th-, and 19th-century England , Plato's ideas influenced many religious thinkers including the Cambridge Platonists . Orthodox Protestantism in continental Europe , however, distrusts natural reason and has often been critical of Platonism. An issue in the reception of Plato in early modern Europe

2703-399: A smaller subsection of the substance. Atoms are constantly moving in one of four different ways. Atoms can simply collide with each other and then bounce off of each other. When joined with each other and forming a larger object, atoms can vibrate as they collide into each other while still maintaining the overall shape of the larger object. When not prevented by other atoms, all atoms move at

2862-407: A state of fear. Complete physical katastematic pleasure is called aponia , and complete mental katastematic pleasure is called ataraxia . While the pursuit of pleasure formed the focal point of the philosophy, this was largely directed to the "static pleasures" of minimizing pain, anxiety and suffering. From this understanding, Epicureans concluded that the greatest pleasure a person could reach

3021-416: A tower from far away that appears to be round, and upon approaching the tower they see that it is actually square, they would come to realize that their original judgement was wrong and correct their wrong opinion. Epicurus is said to have proposed three criteria of truth : sensations ( aisthêsis ), preconceptions ( prolepsis ), and feelings ( pathê ). A fourth criterion called "presentational applications of

3180-612: A variety of arguments. Deductive arguments are mainly studied by formal logic. An argument is deductively valid if the truth of its premises ensures the truth of its conclusion. Deductively valid arguments follow a rule of inference , like modus ponens , which has the following logical form : " p ; if p then q ; therefore q ". An example is the argument "today is Sunday; if today is Sunday then I don't have to go to work today; therefore I don't have to go to work today". The premises of non-deductive arguments also support their conclusion, although this support does not guarantee that

3339-484: Is Philodemus of Gadara 's basic guideline as to how to live the happiest possible life, based on the first four of the doctrines. This poetic doctrine was handed down by an anonymous Epicurean who summed up Epicurus' philosophy on happiness in four simple lines: Don't fear god, Don't worry about death; What is good is easy to get, and What is terrible is easy to endure. Three letters of Epicurus are preserved by Diogenes Laertius. Epicurus' Letter to Herodotus (not

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3498-494: Is a combination of different parts and attempts to identify what those parts are. An influential theory in this area claims that knowledge has three components: it is a belief that is justified and true . This theory is controversial and the difficulties associated with it are known as the Gettier problem . Alternative views state that knowledge requires additional components, like the absence of luck; different components, like

3657-510: Is a common issue in relation to the sources of knowledge and the justification they offer. It is based on the idea that beliefs require some kind of reason or evidence to be justified. The problem is that the source of justification may itself be in need of another source of justification. This leads to an infinite regress or circular reasoning . Foundationalists avoid this conclusion by arguing that some sources can provide justification without requiring justification themselves. Another solution

3816-471: Is a form of hedonism insofar as it declares pleasure to be its sole intrinsic goal. However, the concept that the absence of pain and fear constitutes the greatest pleasure, and its advocacy of a simple life, make it very different from hedonism as colloquially understood. Following the Cyrenaic philosopher Aristippus , Epicurus believed that the greatest good was to seek modest, sustainable pleasure in

3975-561: Is a set of essential features shared by all parts of philosophy. Others see only weaker family resemblances or contend that it is merely an empty blanket term. Precise definitions are often only accepted by theorists belonging to a certain philosophical movement and are revisionistic according to Søren Overgaard et al. in that many presumed parts of philosophy would not deserve the title "philosophy" if they were true. Some definitions characterize philosophy in relation to its method, like pure reasoning. Others focus on its topic, for example, as

4134-420: Is a summary of his ethical teachings written in the epistolary literary style, and addressed to a student. It addresses theology, the hierarchies of desires, how to carry choices and avoidances in order to achieve net pleasure, and other aspects of Epicurean ethics . The Epicurea is a collection of texts, fragments, and testimonies by Epicurus that was collected by Hermann Usener in 1887. This work features

4293-467: Is also concerned with the moral evaluation of character traits and institutions. It explores what the standards of morality are and how to live a good life. Philosophical ethics addresses such basic questions as "Are moral obligations relative?"; "Which has priority: well-being or obligation?"; and "What gives life meaning?" The main branches of ethics are meta-ethics , normative ethics , and applied ethics . Meta-ethics asks abstract questions about

4452-483: Is an expression of the philosopher's love of wisdom and has the aim of improving one's well-being by leading a reflective life. For example, the Stoics saw philosophy as an exercise to train the mind and thereby achieve eudaimonia and flourish in life. As a discipline, the history of philosophy aims to provide a systematic and chronological exposition of philosophical concepts and doctrines. Some theorists see it as

4611-666: Is and how to acquire it. Ethics investigates moral principles and what constitutes right conduct. Logic is the study of correct reasoning and explores how good arguments can be distinguished from bad ones. Metaphysics examines the most general features of reality , existence, objects , and properties . Other subfields are aesthetics , philosophy of language , philosophy of mind , philosophy of religion , philosophy of science , philosophy of mathematics , philosophy of history , and political philosophy . Within each branch, there are competing schools of philosophy that promote different principles, theories, or methods. Philosophers use

4770-602: Is based on mutual agreement, not divine decree. He defined justice as an agreement made by people not to harm each other. The point of living in a society with laws and punishments is to be protected from harm so that one is free to pursue happiness. Because of this, laws that do not contribute to promoting human happiness are not just. He gave his own unique version of the ethic of reciprocity , which differs from other formulations by emphasizing minimizing harm and maximizing happiness for oneself and others: Epicurean ideas on politics disagree with other philosophical traditions, namely

4929-451: Is closely related to the disciplines of logic and linguistics. The philosophy of language rose to particular prominence in the early 20th century in analytic philosophy due to the works of Frege and Russell. One of its central topics is to understand how sentences get their meaning. There are two broad theoretical camps: those emphasizing the formal truth conditions of sentences and those investigating circumstances that determine when it

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5088-408: Is concerned with meaning , understanding , or the clarification of language. According to one view, philosophy is conceptual analysis , which involves finding the necessary and sufficient conditions for the application of concepts. Another definition characterizes philosophy as thinking about thinking to emphasize its self-critical, reflective nature. A further approach presents philosophy as

5247-476: Is generated by and contained in it, as the nous is in the One, and, by informing matter in itself nonexistent, constitutes bodies whose existence is contained in the world-soul. Nature therefore is a whole, endowed with life and soul. Soul, being chained to matter, longs to escape from the bondage of the body and return to its original source. In virtue and philosophical thought it has the power to elevate itself above

5406-460: Is itself a borrowing from the Latin philosophia . The term philosophy acquired the meanings of "advanced study of the speculative subjects ( logic , ethics , physics , and metaphysics )", "deep wisdom consisting of love of truth and virtuous living", "profound learning as transmitted by the ancient writers", and "the study of the fundamental nature of knowledge , reality , and existence , and

5565-408: Is itself considered a pleasurable act, are all examples of kinetic pleasure in the physical sense. According to Epicurus, feelings of joy would be an example of mental kinetic pleasure. Katastematic pleasure is the pleasure one feels while in a state without pain. Like kinetic pleasures, katastematic pleasures can also be physical, such as the state of not being thirsty, or mental, such as freedom from

5724-408: Is living in a dream rather than a wakened state? Isn't this dreaming: whether asleep or awake, to think that a likeness is not a likeness but rather the thing itself that it is like?" "I certainly think that someone who does that is dreaming." "But someone who, to take the opposite case, believes in the beautiful itself, can see both it and the things that participate in it and doesn't believe that

5883-437: Is made up of atoms, which are tiny bodies that have only the unchanging qualities of shape, size, and weight. The Epicureans believed that atoms were unchanging because the world was ordered and that changes had to have specific and consistent sources, e.g. a plant species only grows from a seed of the same species, but that in order for the universe to persist, what it is ultimately made up of must not be able to be changed or else

6042-538: Is my soul that is virtuous as opposed to, say, my body). The soul is also the mind: it is that which thinks in us. This casual oscillation between different roles of the soul is seen in many dialogues. First of all, in the Republic : Is there any function of the soul that you could not accomplish with anything else, such as taking care of something ( epimeleisthai ), ruling, and deliberating, and other such things? Could we correctly assign these things to anything besides

6201-550: Is nothing to us; for that which is dissolved, is without sensation, and that which lacks sensation is nothing to us." From this doctrine arose the Epicurean Epitaph: Non fui, fui, non sum, non curo ("I was not; I have been; I am not; I do not mind."), which is inscribed on the gravestones of his followers and seen on many ancient gravestones of the Roman Empire . Epicureanism does not deny the existence of

6360-509: Is pleasurable, we pursue that thing, and if something is painful, we avoid that thing. The idea of "presentational applications of the mind" is an explanation for how we can discuss and inquire about things we cannot directly perceive. We receive impressions of such things directly in our minds, instead of perceiving them through other senses. The concept of "presentational applications of the mind" may have been introduced to explain how we learn about things that we cannot directly perceive, such as

6519-441: Is possible that some political association could be seen as beneficial by some Epicureans. Some political associations could lead to certain benefits to the individual that would help to maximize pleasure and avoid physical or mental distress. of all the things which wisdom has contrived which contribute to a blessed life, none is more important, more fruitful, than friendship Epicurus laid great emphasis on developing friendships as

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6678-475: Is presented by coherentists , who state that a belief is justified if it coheres with other beliefs of the person. Many discussions in epistemology touch on the topic of philosophical skepticism , which raises doubts about some or all claims to knowledge. These doubts are often based on the idea that knowledge requires absolute certainty and that humans are unable to acquire it. Ethics, also known as moral philosophy, studies what constitutes right conduct . It

6837-418: Is sometimes understood as a proper science in its own right. According to some naturalistic philosophers , such as W. V. O. Quine , philosophy is an empirical yet abstract science that is concerned with wide-ranging empirical patterns instead of particular observations. Science-based definitions usually face the problem of explaining why philosophy in its long history has not progressed to the same extent or in

6996-486: Is suitable to use a sentence, the latter of which is associated with speech act theory . Platonism In a narrower sense, the term might indicate the doctrine of Platonic realism , a form of mysticism. The central concept of Platonism, a distinction essential to the Theory of Forms , is the distinction between the reality which is perceptible but unintelligible, associated with the flux of Heraclitus and studied by

7155-789: Is sure difficult to imagine, however, that none of these would be a part of sex because sex never benefitted anyone. In order to do this an Epicurean had to control their desires, because desire itself was seen as painful. Not only will controlling one's desires bring about aponia , as one will rarely suffer from not being physically satisfied, but controlling one's desires will also help to bring about ataraxia because one will not be anxious about becoming discomforted since one would have so few desires anyway. The Epicureans divide desires into three classes: natural and necessary, natural but not necessary, and vain and empty: If one follows only natural and necessary desires, then, according to Epicurus, one would be able to reach aponia and ataraxia and thereby

7314-439: Is that actions are in tune with those duties and not what consequences they have. Virtue theorists judge actions based on how the moral character of the agent is expressed. According to this view, actions should conform to what an ideally virtuous agent would do by manifesting virtues like generosity and honesty . Logic is the study of correct reasoning . It aims to understand how to distinguish good from bad arguments . It

7473-468: Is the 1687 book Philosophiæ Naturalis Principia Mathematica by Isaac Newton . This book referred to natural philosophy in its title, but it is today considered a book of physics. The meaning of philosophy changed toward the end of the modern period when it acquired the more narrow meaning common today. In this new sense, the term is mainly associated with philosophical disciplines like metaphysics, epistemology, and ethics. Among other topics, it covers

7632-409: Is the end and aim, we do not mean the pleasures of the prodigal or the pleasures of sensuality, as we are understood to do by some through ignorance, prejudice or wilful misrepresentation. By pleasure we mean the absence of pain in the body and of trouble in the soul. It is not by an unbroken succession of drinking bouts and of revelry, not by sexual lust, nor the enjoyment of fish and other delicacies of

7791-473: Is the relation between reason and revelation . Indian philosophy combines the spiritual problem of how to reach enlightenment with the exploration of the nature of reality and the ways of arriving at knowledge. Chinese philosophy focuses principally on practical issues in relation to right social conduct, government, and self-cultivation . Major branches of philosophy are epistemology , ethics , logic , and metaphysics . Epistemology studies what knowledge

7950-457: Is the second letter preserved by Diogenes Laertius in The Lives and Opinions of Eminent Philosophers. In Letter to Pythocles, Epicurus treats the things for which there is uncertainty in how they occur. His train of thought is explicated through meteorological phenomena: various weather events as well as celestial phenomena in space such as asteroids, the creation and destruction of cosmoi, and

8109-423: Is therefore entirely non-physical and non-mental. Platonism in this sense is a contemporary view. This modern Platonism has been endorsed in one way or another at one time or another by numerous philosophers, such as Bernard Bolzano , who argue for anti- psychologism . Plato's works have been decisively influential for 20th century philosophers such as Alfred North Whitehead and his Process Philosophy ; and for

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8268-635: Is true of the just and unjust, the good and the bad, and all the forms. Each of them is itself one, but because they manifest themselves everywhere in association with actions, bodies, and one another, each of them appears to be many." "That's right." "So, I draw this distinction: On one side are those you just now called lovers of sights, lovers of crafts, and practical people; on the other side are those we are now arguing about and whom one would alone call philosophers." "How do you mean?" "The lovers of sights and sounds like beautiful sounds, colors, shapes, and everything fashioned out of them, but their thought

8427-462: Is truth established?"; and "Can we prove causal relations?" Epistemology is primarily interested in declarative knowledge or knowledge of facts, like knowing that Princess Diana died in 1997. But it also investigates practical knowledge , such as knowing how to ride a bicycle, and knowledge by acquaintance , for example, knowing a celebrity personally. One area in epistemology is the analysis of knowledge . It assumes that declarative knowledge

8586-419: Is unable to see and embrace the nature of the beautiful itself." "That's for sure." "In fact, there are very few people who would be able to reach the beautiful itself and see it by itself. Isn't that so?" "Certainly." "What about someone who believes in beautiful things, but doesn't believe in the beautiful itself and isn't able to follow anyone who could lead him to the knowledge of it? Don't you think he

8745-456: Is usually divided into formal and informal logic . Formal logic uses artificial languages with a precise symbolic representation to investigate arguments. In its search for exact criteria, it examines the structure of arguments to determine whether they are correct or incorrect. Informal logic uses non-formal criteria and standards to assess the correctness of arguments. It relies on additional factors such as content and context. Logic examines

8904-556: Is whether beauty is an objective feature of entities or a subjective aspect of experience. Aesthetic philosophers also investigate the nature of aesthetic experiences and judgments . Further topics include the essence of works of art and the processes involved in creating them. The philosophy of language studies the nature and function of language . It examines the concepts of meaning , reference , and truth. It aims to answer questions such as how words are related to things and how language affects human thought and understanding. It

9063-573: The Methodist Church , Christoplatonism directly "contradicts the Biblical record of God calling everything He created good." Apart from historical Platonism originating from thinkers such as Plato and Plotinus, we also encounter the theory of abstract objects in the modern sense. Platonism is the view that there exist such things as abstract objects — where an abstract object is an object that does not exist in space or time and which

9222-527: The Quran . Al-Kindi (801–873 CE) is usually regarded as the first philosopher of this tradition. He translated and interpreted many works of Aristotle and Neoplatonists in his attempt to show that there is a harmony between reason and faith . Avicenna (980–1037 CE) also followed this goal and developed a comprehensive philosophical system to provide a rational understanding of reality encompassing science, religion, and mysticism. Al-Ghazali (1058–1111 CE)

9381-574: The Stoic Cato . His father-in-law, Lucius Calpurnius Piso Caesoninus , was also an adept of the school. In the 2nd century CE, comedian Lucian of Samosata and wealthy promoter of philosophy Diogenes of Oenoanda were prominent Epicureans. By the late third century CE, however, there was little trace of its existence. With growing dominance of Neoplatonism and Peripateticism , and later, Christianity , Epicureanism declined. In his letter to Herodotus , Epicurus presented three principles as to

9540-874: The Villa of the Papyri at Herculaneum . Most of the surviving papyri are kept in the National Library of Naples . Important parts of Book II are preserved in the British Museum . Since most of the 37 books "On Nature" are lost, the Principal Doctrines and Epicurus' Letters to Herodotus, Menoeceus, and Pythocles are the most authoritative writings on Epicureanism. Similarly, Lucretius' poem De rerum natura probably follows Epicurus' work. The Principal Doctrines are forty authoritative conclusions set up as official doctrines by Epicurus, Metrodorus of Lampsacus , Hermarchus of Mitilene and Polyaenus of Lampsacus . The Principal Doctrines exemplify

9699-530: The person with the soul . Many Platonic notions secured a permanent place in Christianity. At the heart of Plato's philosophy is the theory of the soul. Francis Cornford described the twin pillars of Platonism as being the theory of the Forms, on the one hand, and, on the other hand, the doctrine of the immortality of the soul. Indeed, Plato was the first person in the history of philosophy to believe that

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9858-420: The "things themselves", that is, as originally given in experience. They contend that this base-level of experience provides the foundation for higher-order theoretical knowledge, and that one needs to understand the former to understand the latter. An early approach found in ancient Greek and Roman philosophy is that philosophy is the spiritual practice of developing one's rational capacities. This practice

10017-412: The 5th century CE. Its focus was on religious topics and many thinkers used ancient philosophy to explain and further elaborate Christian doctrines . The Renaissance period started in the 14th century and saw a renewed interest in schools of ancient philosophy, in particular Platonism . Humanism also emerged in this period. The modern period started in the 17th century. One of its central concerns

10176-710: The Catholic Church , who was heavily influenced by Plotinus' Enneads , and in turn were foundations for the whole of Western Christian thought. Many ideas of Plato were incorporated by the Roman Catholic Church . The primary concept is the Theory of Forms . The only true being is founded upon the forms, the eternal, unchangeable, perfect types, of which particular objects of moral and responsible sense are imperfect copies. The multitude of objects of sense, being involved in perpetual change, are thereby deprived of all genuine existence. The number of

10335-676: The Epicurean philosopher Philodemus or his teacher Zeno of Sidon along with fragments of works by Epicurus himself. Diogenes of Oenoanda , a wealthy Epicurean in the 2nd century CE, had a portico wall inscribed with tenets of the philosophy erected in Oenoanda , Lycia (present day Turkey). Epicureanism flourished in the Late Hellenistic era and during the Roman era, and many Epicurean communities were established in places such as Antioch , Alexandria , Rhodes , and Herculaneum . By

10494-565: The Epicurean philosophers' practice of publishing summaries and outlines of their teachings for easy memorization. However, they are so concise and short that it's difficult to understand them in depth without the context of additional commentaries and writings by ancient sources or by modern Epicurean practitioners, whenever possible.They are often cited as "PDs" in English. Some of the Principal Doctrines are organized into groups and are meant to be studied together. The first four doctrines make up

10653-621: The Good of the Republic with the transcendent , absolute One of the first hypothesis of the Parmenides (137c-142a). Platonist ethics is based on the Form of the Good . Virtue is knowledge , the recognition of the supreme form of the good. And, since in this cognition , the three parts of the soul, which are reason, spirit, and appetite, all have their share, we get the three virtues, Wisdom, Courage, and Moderation. The bond which unites

10812-530: The Latin translations of Marius Victorinus of the works of Porphyry and/or Plotinus . Platonism was considered authoritative in the Middle Ages . Platonism also influenced both Eastern and Western mysticism . Meanwhile, Platonism influenced various philosophers. While Aristotle became more influential than Plato in the 13th century, St. Thomas Aquinas 's philosophy was still in certain respects fundamentally Platonic. The Renaissance also saw

10971-620: The Old, Middle, and New Academy. The chief figures in the Old Academy were Speusippus (Plato's nephew), who succeeded him as the head of the school (until 339 BC), and Xenocrates (until 313 BC). Both of them sought to fuse Pythagorean speculations on number with Plato's theory of forms. Around 266 BC, Arcesilaus became head of the academy. This phase, known as the Middle Academy , strongly emphasized philosophical skepticism . It

11130-578: The Stoic, Platonist and Aristotelian traditions. To Epicureans all our social relations are a matter of how we perceive each other, of customs and traditions. No one is inherently of higher value or meant to dominate another. That is because there is no metaphysical basis for the superiority of one kind of person, all people are made of the same atomic material and are thus naturally equal. Epicureans also discourage political participation and other involvement in politics. However Epicureans are not apolitical , it

11289-565: The Tetrapharmakos (Four Cures). PD's 10-13 discuss the Epicurean philosophy of science. PD's 18-21 explain the natural limits of desires and in time, and how the flesh is unable to learn these limits but the mind can. PD's 22-25 deal with the importance of the canon, or the Epicurean standard of truth. PD's 31-38 explain the Epicurean doctrines on justice based on mutual advantage and contractarianism. PD's 39-40 call for an intimate society of friends. Tetrapharmakos, or "The four-part cure",

11448-408: The academy , and in the 3rd century BC, Arcesilaus adopted academic skepticism , which became a central tenet of the school until 90 BC when Antiochus added Stoic elements, rejected skepticism, and began a period known as Middle Platonism . In the 3rd century AD, Plotinus added additional mystical elements, establishing Neoplatonism , in which the summit of existence was the One or the Good,

11607-478: The act was initially unnoticed because of possibly being caught and punished. Both punishment and fear of punishment would cause a person disturbance and prevent them from being happy. Epicurus was also an early thinker to develop the notion of justice as a social contract , and in part attempts to address issues with the society described in Plato 's Republic . The social contract theory established by Epicureanism

11766-501: The atoms joined together. Without the swerve, the atoms would never have interacted with each other, and simply continued to move downwards at the same speed. Epicurus also felt that the swerve was what accounted for humanity's free will. If it were not for the swerve, humans would be subject to a never-ending chain of cause and effect. This was a point which Epicureans often used to criticize Democritus ' atomic theory . Epicurean philosophy employs an empirical epistemology, one based on

11925-442: The basic limits of human understanding". Before the modern age, the term philosophy was used in a wide sense. It included most forms of rational inquiry, such as the individual sciences , as its subdisciplines. For instance, natural philosophy was a major branch of philosophy. This branch of philosophy encompassed a wide range of fields, including disciplines like physics, chemistry , and biology . An example of this usage

12084-470: The basis of a satisfying life. The avoidance or freedom from hardship and fear is ideal to the Epicureans. While this avoidance or freedom could conceivably be achieved through political means, it was insisted by Epicurus that involvement in politics would not release one from fear and he advised against a life of politics. Epicurus also discouraged contributing to political society by starting a family, as

12243-441: The beginning of the 20th century. It discusses topics such as ethnophilosophy , négritude , pan-Africanism , Marxism, postcolonialism , the role of cultural identity, relativism , epistemological dualism , and the critique of Eurocentrism . Philosophical questions can be grouped into several branches. These groupings allow philosophers to focus on a set of similar topics and interact with other thinkers who are interested in

12402-508: The benefits of a wife and children are outweighed by the trouble brought about by having a family. Instead Epicurus encouraged a formation of a community of friends outside the traditional political state. This community of virtuous friends would focus on internal affairs and justice. However, Epicureanism is adaptable to circumstance as is the Epicurean approach to politics. The same approaches will not always work in protection from pain and fear. In some situations it will be more beneficial to have

12561-472: The bodies would not have stayed anywhere but would have been dispersed in their course through the infinite void, not having any supports or counterchecks to send them back on their upward rebound. Again, if the void were finite, the infinity of bodies would not have anywhere to be. Because of the infinite supply of atoms, there are an infinite number of worlds, or cosmoi . Some of these worlds could be vastly different from our own, some quite similar, and all of

12720-413: The body and pleasures of the mind . Pleasures of the body involve sensations of the body, such as the act of eating delicious food or of being in a state of comfort free from pain, and exist only in the present. One can only experience pleasures of the body in the moment, meaning they only exist as a person is experiencing them. Pleasures of the mind involve mental processes and states; feelings of joy,

12879-560: The color red, can exist at different locations at the same time. This is not the case for particulars including individual persons or specific objects. Other metaphysical questions are whether the past fully determines the present and what implications this would have for the existence of free will . There are many other subfields of philosophy besides its core branches. Some of the most prominent are aesthetics, philosophy of language, philosophy of mind, philosophy of religion, philosophy of science, and political philosophy. Aesthetics in

13038-461: The conclusion is true. One form is inductive reasoning . It starts from a set of individual cases and uses generalization to arrive at a universal law governing all cases. An example is the inference that "all ravens are black" based on observations of many individual black ravens. Another form is abductive reasoning . It starts from an observation and concludes that the best explanation of this observation must be true. This happens, for example, when

13197-614: The consequences of the general theories developed by normative ethics in specific situations, for example, in the workplace or for medical treatments. Within contemporary normative ethics, consequentialism, deontology , and virtue ethics are influential schools of thought. Consequentialists judge actions based on their consequences. One such view is utilitarianism , which argues that actions should increase overall happiness while minimizing suffering. Deontologists judge actions based on whether they follow moral duties, such as abstaining from lying or killing. According to them, what matters

13356-968: The critical realism and metaphysics of Nicolai Hartmann . In contemporary philosophy, most Platonists trace their ideas to Gottlob Frege 's influential paper "Thought", which argues for Platonism with respect to propositions, and his influential book, The Foundations of Arithmetic , which argues for Platonism with respect to numbers and is a seminal text of the logicist project. Contemporary analytic philosophers who espoused Platonism in metaphysics include Bertrand Russell , Alonzo Church , Kurt Gödel , W. V. O. Quine , David Kaplan , Saul Kripke , Edward Zalta and Peter van Inwagen . Iris Murdoch espoused Platonism in moral philosophy in her 1970 book The Sovereignty of Good . Paul Benacerraf 's epistemological challenge to contemporary Platonism has proved its most influential criticism. In contemporary Continental philosophy , Edmund Husserl 's arguments against psychologism are believed to derive from

13515-400: The emergence and application of formal logic , the focus on the role of language as well as pragmatism , and movements in continental philosophy like phenomenology, existentialism , and post-structuralism . The 20th century saw a rapid expansion of academic philosophy in terms of the number of philosophical publications and philosophers working at academic institutions . There was also

13674-482: The emergence of non-Vedic teachings, like Buddhism and Jainism . Buddhism was founded by Gautama Siddhartha (563–483 BCE), who challenged the Vedic idea of a permanent self and proposed a path to liberate oneself from suffering . Jainism was founded by Mahavira (599–527 BCE), who emphasized non-violence as well as respect toward all forms of life. The subsequent classical period started roughly 200 BCE and

13833-458: The everyday world are imperfect copies. Aristotle 's Third Man Argument is its most famous criticism in antiquity. In the Republic the highest form is identified as the Form of the Good , the source of all other Forms, which could be known by reason. In the Sophist , a later work, the Forms being , sameness and difference are listed among the primordial "Great Kinds". Plato established

13992-407: The features that all entities have in common. Specific metaphysics is interested in different kinds of being, the features they have, and how they differ from one another. An important area in metaphysics is ontology . Some theorists identify it with general metaphysics. Ontology investigates concepts like being , becoming , and reality. It studies the categories of being and asks what exists on

14151-497: The form of a state of ataraxia (tranquility and freedom from fear) and aponia (the absence of bodily pain) through knowledge of the workings of the world and limiting desires. Correspondingly, Epicurus and his followers generally withdrew from politics because it could lead to frustrations and ambitions that would conflict with their pursuit of virtue and peace of mind. Few writings by Epicurus have survived. Diogenes Laërtius preserves three letters written by Epicurus, as well as

14310-406: The forms is defined by the number of universal concepts which can be derived from the particular objects of sense. The following excerpt may be representative of Plato's middle period metaphysics and epistemology: [Socrates:] "Since the beautiful is opposite of the ugly, they are two." [Glaucon:] "Of course." "And since they are two, each is one?" "I grant that also." "And the same account

14469-494: The gods exist outside the mind as material objects (the realist position), while others assert that the gods only exist in our minds as ideals (the idealist position). The realist position holds that Epicureans understand the gods as existing as physical and immortal beings made of atoms that reside somewhere in reality. However, the gods are completely separate from the rest of reality; they are uninterested in it, play no role in it, and remain completely undisturbed by it. Instead,

14628-476: The gods live in what is called the metakosmia , or the space between worlds. Contrarily, the idealist (sometimes called the "non-realist position" to avoid confusion) position holds that the gods are just idealized forms of the best human life, and it is thought that the gods were emblematic of the life one should aspire towards. The debate between these two positions was revived by A. A. Long and David Sedley in their 1987 book, The Hellenistic Philosophers , in which

14787-477: The gods. Epicureanism bases its ethics on a hedonistic set of values, seeing pleasure as the chief good in life. Hence, Epicurus advocated living in such a way as to derive the greatest amount of pleasure possible during one's lifetime, yet doing so moderately in order to avoid the suffering incurred by overindulgence in such pleasure. Epicurus actively recommended against passionate love, and believed it best to avoid marriage altogether. He viewed recreational sex as

14946-464: The gods; rather it denies their involvement in the world. According to Epicureanism, the gods do not interfere with human lives or the rest of the universe in any way – thus, it shuns the idea that frightening weather events are divine retribution. One of the fears the Epicurean ought to be freed from is fear relating to the actions of the gods. The manner in which the Epicurean gods exist is still disputed. Some scholars say that Epicureanism believes that

15105-471: The highest form of happiness. Unnecessary and, especially, artificially produced desires were to be suppressed. It is impossible to live a pleasant life without living wisely and well and justly, and it is impossible to live wisely and well and justly without living a pleasant life. The Epicurean understanding of justice was inherently self-interested. Justice was deemed good because it was seen as mutually beneficial. Individuals would not act unjustly even if

15264-456: The historian) was written as an introduction to Epicurean philosophy and method of studying nature. It included the most complete detail of the ancient conversations that led to the development of atomist theory, a doctrine of innumerable worlds, and an explanation of the phenomenon of time that posits an early form of relativism. Epicurus' Letter to Herodotus appears to be a summary of On Nature , books I–XIII. Epicurus' Letter to Pythocles

15423-539: The history of philosophy include Western , Arabic–Persian , Indian , and Chinese philosophy . Other philosophical traditions are Japanese philosophy , Latin American philosophy , and African philosophy . Western philosophy originated in Ancient Greece in the 6th century BCE with the pre-Socratics . They attempted to provide rational explanations of the cosmos as a whole. The philosophy following them

15582-420: The importance of a strong state and strict laws. Buddhism was introduced to China in the 1st century CE and diversified into new forms of Buddhism . Starting in the 3rd century CE, the school of Xuanxue emerged. It interpreted earlier Daoist works with a specific emphasis on metaphysical explanations. Neo-Confucianism developed in the 11th century CE. It systematized previous Confucian teachings and sought

15741-471: The impressions of sense can never give us the knowledge of true being, i.e., of the forms. It can only be obtained by the soul 's activity within itself, apart from the troubles and disturbances of sense; that is to say, by the exercise of reason . Dialectic , as the instrument in this process, leading us to knowledge of the forms, and finally to the highest form of the Good, is the first of sciences. Later Neoplatonism , beginning with Plotinus , identified

15900-419: The indigenous Shinto religion and Chinese and Indian thought in the forms of Confucianism and Buddhism, both of which entered Japan in the 6th and 7th centuries. Its practice is characterized by active interaction with reality rather than disengaged examination. Neo-Confucianism became an influential school of thought in the 16th century and the following Edo period and prompted a greater focus on language and

16059-511: The individual sciences , such as physics and psychology , formed part of philosophy. However, they are considered separate academic disciplines in the modern sense of the term. Influential traditions in the history of philosophy include Western , Arabic–Persian , Indian , and Chinese philosophy . Western philosophy originated in Ancient Greece and covers a wide area of philosophical subfields. A central topic in Arabic–Persian philosophy

16218-422: The information. Preconceptions, Epicureans argue, provide individuals with that pre-knowledge required for learning. Our feelings or emotions ( pathê ) are how we perceive pleasure and pain. They are analogous to sensations in that they are a means of perception, but they perceive our internal state as opposed to external things. According to Diogenes Laertius, feelings are how we determine our actions. If something

16377-622: The input. For example, when one places a straight oar in the water, it appears bent. The Epicurean would argue that the image of the oar, that is, the atoms traveling from the oar to the observer's eyes, has been shifted and thus really does arrive at the observer's eyes in the shape of a bent oar. The observer makes the error in assuming that the image he or she receives correctly represents the oar and has not been distorted in some way. In order to not make erroneous judgments about perceivable things and instead verify one's judgment, Epicureans believed that one needed to obtain "clear vision" ( enargeia ) of

16536-483: The interconnectedness of all things. Latin American philosophy during the colonial period , starting around 1550, was dominated by religious philosophy in the form of scholasticism . Influential topics in the post-colonial period were positivism , the philosophy of liberation , and the exploration of identity and culture. Early African philosophy, like Ubuntu philosophy , was focused on community, morality, and ancestral ideas. Systematic African philosophy emerged at

16695-419: The lack of fear, and pleasant memories are all examples of pleasures of the mind. These pleasures of the mind do not only exist in the present, but also in the past and future, since memory of a past pleasant experience or the expectation of some potentially pleasing future can both be pleasurable experiences. Because of this, the pleasures of the mind are considered to be greater than those of the body. Emphasis

16854-677: The late 3rd century CE, Epicureanism all but died out, being opposed by other philosophies (mainly Neoplatonism ) that were then in the ascent. Interest in Epicureanism was resurrected in the Age of Enlightenment and continues in the modern era. Epicurus taught and gained followers in Mytilene , the capital of the island Lesbos , and then in Lampsacus . In Athens , Epicurus bought a property for his school called "Garden", which later became

17013-468: The library at the Villa of the Papyri in Herculaneum contain a large number of works by Philodemus , a late Hellenistic Epicurean, and Epicurus himself, attesting to the school's enduring popularity. Julius Caesar also leaned considerably toward Epicureanism, which led to his plea against the death sentence during the trial against Catiline , during the Catiline conspiracy where he spoke out against

17172-469: The likes of science , and the reality which is imperceptible but intelligible, associated with the unchanging being of Parmenides and studied by the likes of mathematics . Geometry was the main motivation of Plato, and this also shows the influence of Pythagoras . The Forms are typically described in dialogues such as the Phaedo , Symposium and Republic as perfect archetypes of which objects in

17331-551: The manifestation of cognitive virtues instead of justification; or they deny that knowledge can be analyzed in terms of other phenomena. Another area in epistemology asks how people acquire knowledge. Often-discussed sources of knowledge are perception , introspection , memory , inference , and testimony . According to empiricists , all knowledge is based on some form of experience. Rationalists reject this view and hold that some forms of knowledge, like innate knowledge , are not acquired through experience. The regress problem

17490-438: The mind" ( phantastikai epibolai tês dianoias ) was said to have been added by later Epicureans. These criteria formed the method through which Epicureans thought we gained knowledge. Since Epicureans thought that sensations could not deceive, sensations are the first and main criterion of truth for Epicureans. Even in cases where sensory input seems to mislead, the input itself is true and the error arises from our judgments about

17649-596: The most fundamental level. Another subfield of metaphysics is philosophical cosmology . It is interested in the essence of the world as a whole. It asks questions including whether the universe has a beginning and an end and whether it was created by something else. A key topic in metaphysics concerns the question of whether reality only consists of physical things like matter and energy. Alternative suggestions are that mental entities (such as souls and experiences ) and abstract entities (such as numbers) exist apart from physical things. Another topic in metaphysics concerns

17808-404: The most influential philosophers of the subsequent period. The increasing influence of Western thought and institutions in the 19th and 20th centuries gave rise to the intellectual movement of Islamic modernism , which aims to understand the relation between traditional Islamic beliefs and modernity. One of the distinguishing features of Indian philosophy is that it integrates the exploration of

17967-458: The name of Epicurus' school. Its members included Hermarchus , Idomeneus , Colotes , Polyaenus , and Metrodorus . Epicurus emphasized friendship as an important ingredient of happiness, and the school seems to have been a moderately ascetic community which rejected the political limelight of Athenian philosophy. They were fairly cosmopolitan by Athenian standards, including women and slaves. Community activities held some importance, particularly

18126-472: The natural and social sciences, religion, and mathematics. Epistemology is the branch of philosophy that studies knowledge. It is also known as theory of knowledge and aims to understand what knowledge is, how it arises, what its limits are, and what value it has. It further examines the nature of truth , belief , justification , and rationality . Some of the questions addressed by epistemologists include "By what method(s) can one acquire knowledge?"; "How

18285-504: The natural world. The Kyoto School emerged in the 20th century and integrated Eastern spirituality with Western philosophy in its exploration of concepts like absolute nothingness ( zettai-mu ), place ( basho ), and the self . Latin American philosophy in the pre-colonial period was practiced by indigenous civilizations and explored questions concerning the nature of reality and the role of humans. It has similarities to indigenous North American philosophy , which covered themes such as

18444-455: The nature and sources of morality. It analyzes the meaning of ethical concepts, like right action and obligation . It also investigates whether ethical theories can be true in an absolute sense and how to acquire knowledge of them. Normative ethics encompasses general theories of how to distinguish between right and wrong conduct. It helps guide moral decisions by examining what moral obligations and rights people have. Applied ethics studies

18603-471: The nature of reality, the ways of arriving at knowledge, and the spiritual question of how to reach enlightenment . It started around 900 BCE when the Vedas were written. They are the foundational scriptures of Hinduism and contemplate issues concerning the relation between the self and ultimate reality as well as the question of how souls are reborn based on their past actions . This period also saw

18762-442: The nature of the physical world, i.e. that that which exists cannot come into being from that which does not exist, that which is destroyed does not cease to exist, and all that exists now always did exist and always will. The object of these principles was to establish the fact that all that constitutes the world is permanent and unchanging. Epicurean physics held that the entire universe consisted of two things: matter and void. Matter

18921-416: The novelty of Plato's theory of the soul is that it was the first to unite the different features and powers of the soul that became commonplace in later ancient and medieval philosophy. For Plato, the soul moves things by means of its thoughts, as one scholar puts it, and accordingly, the soul is both a mover (i.e., the principle of life, where life is conceived of as self-motion ) and a thinker. Platonism

19080-470: The observance of Eikas , a monthly social gathering. Some members were also vegetarians as, from slight evidence, Epicurus did not eat meat, although no prohibition against eating meat was made. The school's popularity grew and it became, along with Stoicism , Platonism , Peripateticism , and Pyrrhonism , one of the dominant schools of Hellenistic philosophy , lasting strongly through the later Roman Empire . Deciphered carbonized scrolls obtained from

19239-588: The other virtues is the virtue of Justice, by which each part of the soul is confined to the performance of its proper function. Platonism had a profound effect on Western thought . In many interpretations of the Timaeus Platonism, like Aristotelianism , poses an eternal universe , as opposed to the nearby Judaic tradition that the universe had been created in historical time, with its continuous history recorded. Unlike Aristotelianism, Platonism describes idea as prior to matter and identifies

19398-459: The participants are it or that it itself is the participants—is he living in a dream or is he awake? "He's very much awake." ( Republic Bk. V, 475e-476d, translation G. M. A. Grube) Book VI of the Republic identifies the highest form as the Form of the Good , the cause of all other Ideas , and that on which the being and knowing of all other Forms is contingent. Conceptions derived from

19557-639: The paths of planetary bodies through space. In Epicurus' time, long before any modern technological advances such as microscopes or telescopes which allow us to establish greater knowledge of these phenomena, these were all examples of things that, as far as the limits of human knowledge extended, it was impossible to establish certainty with regards to their causes, or how they occurred. Epicurus elaborates on how one may reason regarding such things so as to come to reasonable conclusions without undue certainty, so as to maintain Ataraxia . Epicurus' Letter to Menoeceus

19716-434: The perceivable thing by closer examination. This acted as a justification for one's judgements about the thing being perceived. Enargeia is characterized as sensation of an object that has been unchanged by judgments or opinions and is a clear and direct perception of that object. An individual's preconceptions are his or her concepts of what things are, e.g. what someone's idea of a horse is, and these concepts are formed in

19875-704: The period known as Middle Platonism , in which Platonism was fused with certain Peripatetic and many Stoic dogmas . In Middle Platonism, the Platonic Forms were not transcendent but immanent to rational minds, and the physical world was a living, ensouled being, the World-Soul . Pre-eminence in this period belongs to Plutarch . The eclectic nature of Platonism during this time is shown by its incorporation into Pythagoreanism ( Numenius of Apamea ) and into Jewish philosophy ( Philo of Alexandria ). In

20034-436: The philosophical sense is the field that studies the nature and appreciation of beauty and other aesthetic properties, like the sublime . Although it is often treated together with the philosophy of art , aesthetics is a broader category that encompasses other aspects of experience, such as natural beauty. In a more general sense, aesthetics is "critical reflection on art, culture, and nature ". A key question in aesthetics

20193-417: The precise definition of the term and its meaning has changed throughout the ages. Metaphysicians attempt to answer basic questions including " Why is there something rather than nothing? "; "Of what does reality ultimately consist?"; and "Are humans free?" Metaphysics is sometimes divided into general metaphysics and specific or special metaphysics. General metaphysics investigates being as such. It examines

20352-400: The problem of identity . One question is how much an entity can change while still remaining the same entity. According to one view, entities have essential and accidental features . They can change their accidental features but they cease to be the same entity if they lose an essential feature. A central distinction in metaphysics is between particulars and universals . Universals, like

20511-428: The provocative, vexing, and enduring problems central to the human condition. The philosophical pursuit of wisdom involves asking general and fundamental questions. It often does not result in straightforward answers but may help a person to better understand the topic, examine their life, dispel confusion, and overcome prejudices and self-deceptive ideas associated with common sense. For example, Socrates stated that "

20670-436: The rational study of reality, knowledge, and values. It is distinguished from other disciplines of rational inquiry such as the empirical sciences and mathematics . The practice of philosophy is characterized by several general features: it is a form of rational inquiry, it aims to be systematic, and it tends to critically reflect on its own methods and presuppositions. It requires attentively thinking long and carefully about

20829-477: The reason into a state of ecstasy, where it can behold, or ascend to, that one good primary Being whom reason cannot know. To attain this union with the Good, or the One is the true function of human beings. Plotinus' disciple, Porphyry , followed by Iamblichus , developed the system in conscious opposition to Christianity —even as many influential early Christian writers took inspiration from it in their conceptions of monotheistic theology. The Platonic Academy

20988-488: The same questions. Epistemology, ethics, logic, and metaphysics are sometimes listed as the main branches. There are many other subfields besides them and the different divisions are neither exhaustive nor mutually exclusive. For example, political philosophy, ethics, and aesthetics are sometimes linked under the general heading of value theory as they investigate normative or evaluative aspects. Furthermore, philosophical inquiry sometimes overlaps with other disciplines in

21147-401: The same speed naturally downwards in relation to the rest of the world. This downwards motion is natural for atoms; however, as their fourth means of motion, atoms can at times randomly swerve out of their usual downwards path. This swerving motion is what allowed for the creation of the universe, since as more and more atoms swerved and collided with each other, objects were able to take shape as

21306-410: The same way as the sciences. This problem is avoided by seeing philosophy as an immature or provisional science whose subdisciplines cease to be philosophy once they have fully developed. In this sense, philosophy is sometimes described as "the midwife of the sciences". Other definitions focus on the contrast between science and philosophy. A common theme among many such conceptions is that philosophy

21465-508: The scope and fundamental concepts of these fields. It also investigates their methods and ethical implications. The word philosophy comes from the Ancient Greek words φίλος ( philos ) ' love ' and σοφία ( sophia ) ' wisdom ' . Some sources say that the term was coined by the pre-Socratic philosopher Pythagoras , but this is not certain. The word entered the English language primarily from Old French and Anglo-Norman starting around 1175 CE. The French philosophie

21624-494: The senses. Epicureans believed that senses also relied on atoms. Every object was continually emitting particles from itself that would then interact with the observer. All sensations, such as sight, smell, or sound, relied on these particles. While the atoms that were emitted did not have the qualities that the senses were perceiving, the manner in which they were emitted caused the observer to experience those sensations, e.g. red particles were not themselves red but were emitted in

21783-497: The soul was both the source of life and the mind. In Plato's dialogues, the soul plays many disparate roles. Among other things, Plato believes that the soul is what gives life to the body (which was articulated most of all in the Laws and Phaedrus ) in terms of self-motion: to be alive is to be capable of moving oneself; the soul is a self-mover. He also thinks that the soul is the bearer of moral properties (i.e., when I am virtuous, it

21942-428: The soul, and say that they are characteristic ( idia ) of it? No, to nothing else. What about living? Will we deny that this is a function of the soul? That absolutely is. The Phaedo most famously caused problems to scholars who were trying to make sense of this aspect of Plato's theory of the soul, such as Broadie and Dorothea Frede. More-recent scholarship has overturned this accusation arguing that part of

22101-506: The source of all things; in virtue and meditation the soul had the power to elevate itself to attain union with the One. Many Platonic notions were adopted by the Christian church which understood Plato's Forms as God's thoughts (a position also known as divine conceptualism), while Neoplatonism became a major influence on Christian mysticism in the West through Saint Augustine , Doctor of

22260-598: The study of the biggest patterns of the world as a whole or as the attempt to answer the big questions. Such an approach is pursued by Immanuel Kant , who holds that the task of philosophy is united by four questions: "What can I know?"; "What should I do?"; "What may I hope?"; and "What is the human being?" Both approaches have the problem that they are usually either too wide, by including non-philosophical disciplines, or too narrow, by excluding some philosophical sub-disciplines. Many definitions of philosophy emphasize its intimate relation to science. In this sense, philosophy

22419-469: The teachings of Advaita Vedanta to argue that all the different religions are valid paths toward the one divine. Chinese philosophy is particularly interested in practical questions associated with right social conduct, government, and self-cultivation . Many schools of thought emerged in the 6th century BCE in competing attempts to resolve the political turbulence of that period. The most prominent among them were Confucianism and Daoism . Confucianism

22578-439: The tenets of Christianity and Islam that are today classified as 'orthodox' teachings, but also the gnostic or esoteric 'heterodox' traditions of these religions that circulated in the ancient world, such as the former major world religion Manichaeism , Mandaeism , and Hermeticism . Through European Renaissance scholarship on Hermeticism and direct Platonic philosophy (among other esoteric and philosophical scholarship of

22737-407: The third century, Plotinus recast Plato's system, establishing Neoplatonism , in which Middle Platonism was fused with mysticism . At the summit of existence stands the One or the Good, as the source of all things. It generates from itself, as if from the reflection of its own being, reason, the nous , wherein is contained the infinite store of ideas. The world-soul , the copy of the nous ,

22896-457: The two argued in favour of the idealist position. While a scholarly consensus has yet to be reached, the realist position remains the prevailing viewpoint at this time. On Nature ( Ancient Greek : Περὶ φύσεως ) is the name of a philosophical treatise in 37 books consisting of lectures written by Epicurus, which can be considered his main work, however, it has mostly been lost. Some excerpts have survived compiled from burnt papyri scrolls found in

23055-601: The unexamined life is not worth living " to highlight the role of philosophical inquiry in understanding one's own existence. And according to Bertrand Russell , "the man who has no tincture of philosophy goes through life imprisoned in the prejudices derived from common sense, from the habitual beliefs of his age or his nation, and from convictions which have grown up in his mind without the cooperation or consent of his deliberate reason." Attempts to provide more precise definitions of philosophy are controversial and are studied in metaphilosophy . Some approaches argue that there

23214-422: The universe would be essentially destroyed. Epicurus holds that there must be an infinite supply of atoms, although only a finite number of types of atoms, as well as an infinite amount of void. Epicurus explains this position in his letter to Herodotus: Moreover, the sum of things is unlimited both by reason of the multitude of the atoms and the extent of the void. For if the void were infinite and bodies finite,

23373-407: The worlds were separated from each other by vast areas of void ( metakosmia ). Epicureanism states that atoms are unable to be broken down into any smaller parts because void is necessary for matter to move. Anything which consists of both void and matter can be broken down, while if something contains no void then it has no way to break apart because no part of the substance could be broken down into

23532-472: Was a strong critic of the idea that reason can arrive at a true understanding of reality and God. He formulated a detailed critique of philosophy and tried to assign philosophy a more limited place besides the teachings of the Quran and mystical insight. Following Al-Ghazali and the end of the classical period, the influence of philosophical inquiry waned. Mulla Sadra (1571–1636 CE) is often regarded as one of

23691-481: Was characterized by its attacks on the Stoics and their assertion of the certainty of truth and our knowledge of it . The New Academy began with Carneades in 155 BC, the fourth head in succession from Arcesilaus . It was still largely skeptical, denying the possibility of knowing an absolute truth ; both Arcesilaus and Carneades argued that they were maintaining a genuine tenet of Plato . Around 90 BC, Antiochus of Ascalon rejected skepticism, making way for

23850-437: Was characterized by the emergence of the six orthodox schools of Hinduism : Nyāyá , Vaiśeṣika , Sāṃkhya , Yoga , Mīmāṃsā , and Vedanta . The school of Advaita Vedanta developed later in this period. It was systematized by Adi Shankara ( c.  700 –750 CE), who held that everything is one and that the impression of a universe consisting of many distinct entities is an illusion . A slightly different perspective

24009-660: Was defended by Ramanuja (1017–1137 CE), who founded the school of Vishishtadvaita Vedanta and argued that individual entities are real as aspects or parts of the underlying unity. He also helped to popularize the Bhakti movement , which taught devotion toward the divine as a spiritual path and lasted until the 17th to 18th centuries CE. The modern period began roughly 1800 CE and was shaped by encounters with Western thought. Philosophers tried to formulate comprehensive systems to harmonize diverse philosophical and religious teachings. For example, Swami Vivekananda (1863–1902 CE) used

24168-511: Was founded by Confucius (551–479 BCE). It focused on different forms of moral virtues and explored how they lead to harmony in society. Daoism was founded by Laozi (6th century BCE) and examined how humans can live in harmony with nature by following the Dao or the natural order of the universe. Other influential early schools of thought were Mohism , which developed an early form of altruistic consequentialism , and Legalism , which emphasized

24327-512: Was how philosophical and scientific knowledge are created. Specific importance was given to the role of reason and sensory experience . Many of these innovations were used in the Enlightenment movement to challenge traditional authorities. Several attempts to develop comprehensive systems of philosophy were made in the 19th century, for instance, by German idealism and Marxism . Influential developments in 20th-century philosophy were

24486-518: Was how to deal with the same-sex elements of his corpus. Christoplatonism is a term used to refer to a dualism opined by Plato, which holds spirit is good but matter is evil, which influenced some Christian churches , though the Bible's teaching directly contradicts this philosophy and thus it receives constant criticism from many teachers in the Christian Church today. According to

24645-485: Was originally expressed in the dialogues of Plato , in which the figure of Socrates is used to expound certain doctrines, that may or may not be similar to the thought of the historical Socrates , Plato's master. Plato delivered his lectures at the Platonic Academy, a precinct containing a sacred grove outside the walls of Athens . The school continued there long after Plato's death. There were three periods:

24804-525: Was placed on pleasures of the mind rather than on physical pleasures. The Epicureans further divided each of these types of pleasures into two categories: kinetic pleasure and katastematic pleasure . Absence of pain, aponia , and lack of disturbance of mind, ataraxia , are two of the katastematic pleasures and often seen as the focal ones to Epicurus . Kinetic pleasure is the physical or mental pleasures that involve action or change. Eating delicious food, as well as fulfilling desires and removing pain, which

24963-497: Was re-established during this period; its most renowned head was Proclus (died 485), a celebrated commentator on Plato's writings. The academy persisted until Roman emperor Justinian closed it in 529. Platonism has had some influence on Christianity through Clement of Alexandria and Origen , and the Cappadocian Fathers . St. Augustine was heavily influenced by Platonism as well, which he encountered through

25122-449: Was shaped by Socrates (469–399 BCE), Plato (427–347 BCE), and Aristotle (384–322 BCE). They expanded the range of topics to questions like how people should act , how to arrive at knowledge , and what the nature of reality and mind is. The later part of the ancient period was marked by the emergence of philosophical movements, for example, Epicureanism , Stoicism , Skepticism , and Neoplatonism . The medieval period started in

25281-441: Was the complete removal of all pain, both physical and mental. The ultimate goal then of Epicurean ethics was to reach a state of aponia and ataraxia . I learn that your bodily inclination leans most keenly towards sexual intercourse. If you neither violate the laws nor disturb well established morals nor sadden someone close to you, nor strain your body, nor spend what is needed for necessities, use your own choice as you wish. It

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