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136-401: Several of the schools of Hellenistic philosophy have the sage as a featured figure. Karl Ludwig Michelet wrote that "Greek religion culminated with its true god, the sage"; Pierre Hadot develops this idea, stating that "the moment philosophers achieve a rational conception of God based on the model of the sage, Greece surpasses its mythical representation of its gods." Indeed, the actions of

272-508: A relation between a knower and a known proposition , in the case above between the person Ravi and the proposition "kangaroos hop". It is use-independent since it is not tied to one specific purpose. It is a mental representation that relies on concepts and ideas to depict reality. Because of its theoretical nature, it is often held that only relatively sophisticated creatures, such as humans, possess propositional knowledge. Propositional knowledge contrasts with non-propositional knowledge in

408-412: A series of thought experiments that aimed to show that some justified true beliefs do not amount to knowledge. In one of them, a person is unaware of all the fake barns in their area. By coincidence, they stop in front of the only real barn and form a justified true belief that it is a real barn. Many epistemologists agree that this is not knowledge because the justification is not directly relevant to

544-442: A belief is information that favors or supports it. Epistemologists understand evidence primarily in terms of mental states, for example, as sensory impressions or as other propositions that a person knows. But in a wider sense, it can also include physical objects, like bloodstains examined by forensic analysts or financial records studied by investigative journalists. Evidence is often understood in terms of probability : evidence for

680-634: A belief is justified if it coheres with other beliefs. Foundationalists , by contrast, maintain that the justification of basic beliefs does not depend on other beliefs. Internalism and externalism disagree about whether justification is determined solely by mental states or also by external circumstances. Separate branches of epistemology are dedicated to knowledge found in specific fields, like scientific, mathematical, moral, and religious knowledge. Naturalized epistemology relies on empirical methods and discoveries, whereas formal epistemology uses formal tools from logic . Social epistemology investigates

816-473: A belief is justified if the individual's evidence supports the belief and they hold the belief on the basis of this evidence. Reliabilism is an externalist theory asserting that a reliable connection between belief and truth is required for justification. Some reliabilists explain this in terms of reliable processes. According to this view, a belief is justified if it is produced by a reliable belief-formation process, like perception. A belief-formation process

952-612: A belief makes it more likely that the belief is true. A defeater is evidence against a belief or evidence that undermines another piece of evidence. For instance, witness testimony connecting a suspect to a crime is evidence for their guilt while an alibi is a defeater. Evidentialists analyze justification in terms of evidence by saying that to be justified, a belief needs to rest on adequate evidence. The presence of evidence usually affects doubt and certainty , which are subjective attitudes toward propositions that differ regarding their level of confidence. Doubt involves questioning

1088-592: A belief, known as propositional justification , but also in whether the person holds the belief because or based on this reason, known as doxastic justification . For example, if a person has sufficient reason to believe that a neighborhood is dangerous but forms this belief based on superstition then they have propositional justification but lack doxastic justification. Sources of justification are ways or cognitive capacities through which people acquire justification. Often-discussed sources include perception , introspection , memory , reason , and testimony , but there

1224-414: A common view, this means that the person has sufficient reasons for holding this belief because they have information that supports it. Another view states that a belief is justified if it is formed by a reliable belief formation process, such as perception. The terms reasonable , warranted , and supported are closely related to the idea of justification and are sometimes used as synonyms. Justification

1360-781: A continuous sensation because of how quickly they move. The epistemology of the Epicureans was empiricist , with knowledge being ultimately sourced from the senses. Epicurus argued that sensory information is never false, though it may be misleading sometimes, and that "If you fight against all sensations, you will not have a standard against to which judge even those of them you say are mistaken". He responded to an objection to empiricism made by Plato in Meno , according to which one cannot search for information without having some pre-existing idea of what to search for, hence meaning that knowledge must precede experience. The Epicurean response

1496-490: 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. Greek philosophical skepticism , as a distinct philosophical movement , began with Pyrrho of Elis and Timon of Phlius in the 3rd century BC. Following the death of Timon of Phlius , When the Platonic Academy became

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1632-573: A disease helps a doctor cure their patient, and knowledge of when a job interview starts helps a candidate arrive on time. The usefulness of a known fact depends on the circumstances. Knowledge of some facts may have little to no uses, like memorizing random phone numbers from an outdated phone book. Being able to assess the value of knowledge matters in choosing what information to acquire and transmit to others. It affects decisions like which subjects to teach at school and how to allocate funds to research projects. Of particular interest to epistemologists

1768-512: A fiery nature by being received into the seminal reason (" logos spermatikos ") of the Universe". Since right Reason is the foundation of both humanity and the universe, it follows that the goal of life is to live according to Reason, that is, to live a life according to Nature . Similarly, space and the Universe have neither start nor end, rather they are cyclical. The current Universe is

1904-452: A letter, a newspaper, and a blog. Rationality is closely related to justification and the terms rational belief and justified belief are sometimes used as synonyms. However, rationality has a wider scope that encompasses both a theoretical side, covering beliefs, and a practical side, covering decisions , intentions , and actions . There are different conceptions about what it means for something to be rational. According to one view,

2040-416: A mental state is rational if it is based on or responsive to good reasons. Another view emphasizes the role of coherence, stating that rationality requires that the different mental states of a person are consistent and support each other. A slightly different approach holds that rationality is about achieving certain goals. Two goals of theoretical rationality are accuracy and comprehensiveness, meaning that

2176-410: A person already has, asserting that a person should only change their beliefs if they have a good reason to. One motivation for adopting epistemic conservatism is that the cognitive resources of humans are limited, meaning that it is not feasible to constantly reexamine every belief. Pragmatist epistemology is a form of fallibilism that emphasizes the close relation between knowing and acting. It sees

2312-744: A person has as few false beliefs and as many true beliefs as possible. Epistemic norms are criteria to assess the cognitive quality of beliefs, like their justification and rationality. Epistemologists distinguish between deontic norms, which are prescriptions about what people should believe or which beliefs are correct, and axiological norms, which identify the goals and values of beliefs. Epistemic norms are closely related to intellectual or epistemic virtues , which are character traits like open-mindedness and conscientiousness . Epistemic virtues help individuals form true beliefs and acquire knowledge. They contrast with epistemic vices and act as foundational concepts of virtue epistemology . Evidence for

2448-419: A person knows depends on the subjective criteria or social conventions used to assess epistemic status. The debate between empiricism and rationalism centers on the origins of human knowledge. Empiricism emphasizes that sense experience is the primary source of all knowledge. Some empiricists express this view by stating that the mind is a blank slate that only develops ideas about the external world through

2584-404: A phase in the present cycle, preceded by an infinite number of Universes, doomed to be destroyed (" ekpyrōsis ", conflagration ) and re-created again , and to be followed by another infinite number of Universes. Stoicism considers all existence as cyclical, the cosmos as eternally self-creating and self-destroying (see also Eternal return ). The foundation of Stoic ethics is that good lies in

2720-559: A plausible guide, the possession of which, however, formed the real distinction between the sage and the fool. Slight as the difference may appear between the positions of the Academics and the Pyrrhonists, a comparison of their lives leads to the conclusion that a practical philosophical moderation was the characteristic of the Academics whereas the objectives of the Pyrrhonists were more psychological. The Academics did not doubt

2856-507: A posteriori knowledge. A priori knowledge is knowledge of non-empirical facts and does not depend on evidence from sensory experience. It belongs to fields such as mathematics and logic , like knowing that 2 + 2 = 4 {\displaystyle 2+2=4} . The contrast between a posteriori and a priori knowledge plays a central role in the debate between empiricists and rationalists on whether all knowledge depends on sensory experience. A closely related contrast

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2992-554: A state. Despite this, the Stoics regarded sages as the only virtuous and happy humans. All others are regarded as fools, morally vicious, slaves and unfortunate. The Stoics did not admit any middle ground, as Cicero articulated the concept: "every non-sage is mad." The Stoics conceived of the sage as an individual beyond any possibility of harm from fate. The difficulties of life faced by other humans (illness, poverty, criticism, bad reputation, death, etc.) could not cause any sorrow to

3128-520: A third of its length discussing the sage. The Stoic sage was understood to be an inaccessible ideal rather than a concrete reality. The aim of Stoicism was to live a life of virtue , where "virtue consists in a will which is in agreement with Nature." As such, the sage is one who has attained such a state of being and whose life consequently becomes tranquil . The standard was so high that Stoics were unsure whether one had ever existed; if so, possibly only Socrates or Diogenes of Sinope had achieved such

3264-412: A true or a false proposition. According to the correspondence theory of truth , to be true means to stand in the right relation to the world by accurately describing what it is like. This means that truth is objective: a belief is true if it corresponds to a fact . The coherence theory of truth says that a belief is true if it belongs to a coherent system of beliefs. A result of this view is that truth

3400-534: Is Academica , written by the Academic skeptic philosopher Cicero . While the objective of the Pyrrhonists was the attainment of ataraxia , after Arcesilaus the Academics did not hold up ataraxia as the central objective. The Academics focused on criticizing the dogmas of other schools of philosophy, in particular of the dogmatism of the Stoics . They acknowledged some vestiges of a moral law within, at best but

3536-402: Is and what types of knowledge there are. It further investigates the sources of knowledge, like perception , inference , and testimony , to determine how knowledge is created. Another topic is the extent and limits of knowledge, confronting questions about what people can and cannot know. Other central concepts include belief , truth , justification , evidence , and reason . Epistemology

3672-408: Is a closely related process focused not on external physical objects but on internal mental states . For example, seeing a bus at a bus station belongs to perception while feeling tired belongs to introspection. Rationalists understand reason as a source of justification for non-empirical facts. It is often used to explain how people can know about mathematical, logical, and conceptual truths. Reason

3808-409: Is a comparative term, meaning that to know something involves distinguishing it from relevant alternatives. For example, if a person spots a bird in the garden, they may know that it is a sparrow rather than an eagle but they may not know that it is a sparrow rather than an indistinguishable sparrow hologram. Epistemic conservatism is a view about belief revision . It gives preference to the beliefs

3944-573: Is a quart of beans and to care for nothing". Stoicism would be based on the ethical ideas of the Cynics . The Cyrenaics , beginning with Aristippus the Younger , the grandson of the founder, argued that the reason pleasure was good was that it was evident in human behavior from the youngest age, because this made it natural and therefore good (the so-called cradle argument ). The Cyrenaics also believed that present pleasure freed one from anxiety of

4080-521: Is a special epistemic good that, unlike knowledge, is always intrinsically valuable. Wisdom is similar in this regard and is sometimes considered the highest epistemic good. It encompasses a reflective understanding with practical applications. It helps people grasp and evaluate complex situations and lead a good life. Philosophical skepticism questions the human ability to arrive at knowledge. Some skeptics limit their criticism to certain domains of knowledge. For example, religious skeptics say that it

4216-439: Is also responsible for inferential knowledge, in which one or several beliefs are used as premises to support another belief. Memory depends on information provided by other sources, which it retains and recalls, like remembering a phone number perceived earlier. Justification by testimony relies on information one person communicates to another person. This can happen by talking to each other but can also occur in other forms, like

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4352-615: Is also the first to develop this notion of the sage in various works. Within The Republic , Plato indicates that when a friend of a sage dies, the sage "will not think that for a good man... death is a terrible thing." In the Theaetetus , Plato defines the sage as one who becomes "righteous and holy and wise." The Platonic sages would raise themselves by the life of their mind, while the Aristotelian sages raise themselves to

4488-458: Is an oversimplification of much more complex psychological processes. Beliefs play a central role in various epistemological debates, which cover their status as a component of propositional knowledge, the question of whether people have control over and are responsible for their beliefs , and the issue of whether there are degrees of beliefs, called credences . As propositional attitudes, beliefs are true or false depending on whether they affirm

4624-507: Is ataraxia, it is best known for its epistemological arguments, particularly the problem of the criterion , and for being the first Western school of philosophy to identify the problem of induction and the Münchhausen trilemma . Pyrrhonists (or Pyrrhonist practice) can be subdivided into those who are ephectic (engaged in suspension of judgment), zetetic (engaged in seeking), or aporetic (engaged in refutation). Pyrrhonist practice

4760-424: Is better because it is more stable. Another suggestion focuses on practical reasoning . It proposes that people put more trust in knowledge than in mere true beliefs when drawing conclusions and deciding what to do. A different response says that knowledge has intrinsic value, meaning that it is good in itself independent of its usefulness. Beliefs are mental states about what is the case, like believing that snow

4896-403: Is between analytic and synthetic truths . A sentence is analytically true if its truth depends only on the meaning of the words it uses. For instance, the sentence "all bachelors are unmarried" is analytically true because the word "bachelor" already includes the meaning "unmarried". A sentence is synthetically true if its truth depends on additional facts. For example, the sentence "snow is white"

5032-439: Is correct. Some philosophers, such as Timothy Williamson , reject the basic assumption underlying the analysis of knowledge by arguing that propositional knowledge is a unique state that cannot be dissected into simpler components. The value of knowledge is the worth it holds by expanding understanding and guiding action. Knowledge can have instrumental value by helping a person achieve their goals. For example, knowledge of

5168-405: Is disturbed, powerless, subservient to another and worthless to oneself." Epictetus claims that only after the removal of any attachments to things in the external world could a Stoic truly possess friendship. He also outlined that progress towards sagehood would occur when one has learned what is in one's power. This would only come from the correct use of impressions. Marcus Aurelius defines

5304-468: Is for the purpose of achieving epoché , i.e., suspension of judgment . The core practice is through setting argument against argument. To aid in this, the Pyrrhonist philosophers Aenesidemus and Agrippa developed sets of stock arguments known as "modes" or " tropes ." Around 90 BC, Antiochus of Ascalon rejected skepticism, making way for the period known as Middle Platonism , in which Platonism

5440-416: Is important for explaining the nature of illusions. Constructivism in epistemology is the theory that how people view the world is not a simple reflection of external reality but an invention or a social construction. This view emphasizes the creative role of interpretation while undermining objectivity since social constructions may differ from society to society. According to contrastivism , knowledge

5576-504: Is impossible . Ideas or notions are never true; nevertheless, there are degrees of truth-likeness, and hence degrees of belief, which allow one to act. The school was characterized by its attacks on the Stoics and on the Stoic dogma that convincing impressions led to true knowledge . The most important Academics were Arcesilaus , Carneades , and Philo of Larissa . The most extensive ancient source of information about Academic skepticism

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5712-460: Is impossible to have certain knowledge about the existence of deities or other religious doctrines. Similarly, moral skeptics challenge the existence of moral knowledge and metaphysical skeptics say that humans cannot know ultimate reality. Global skepticism is the widest form of skepticism, asserting that there is no knowledge in any domain. In ancient philosophy , this view was accepted by academic skeptics while Pyrrhonian skeptics recommended

5848-443: Is itself a knowledge claim. Another objection says that the abstract reasoning leading to skepticism is not convincing enough to overrule common sense. Fallibilism is another response to skepticism. Fallibilists agree with skeptics that absolute certainty is impossible. Most fallibilists disagree with skeptics about the existence of knowledge, saying that there is knowledge since it does not require absolute certainty. They emphasize

5984-441: 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

6120-451: 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 the atoms joined together. Without the swerve, the atoms would never have interacted with each other, and simply continued to move downwards at

6256-419: Is no phantasia kataleptike ("criterion") of truth. Carneades also assailed Stoic theology and physics . In answer to the doctrine of final cause, of design in nature, he pointed to those things which cause destruction and danger to man, to the evil committed by men endowed with reason, to the miserable condition of humanity, and to the misfortunes that assail the good man. There is, he concluded, no evidence for

6392-469: Is no universal agreement to what extent they all provide valid justification. Perception relies on sensory organs to gain empirical information. There are various forms of perception corresponding to different physical stimuli, such as visual , auditory , haptic , olfactory , and gustatory perception. Perception is not merely the reception of sense impressions but an active process that selects, organizes, and interprets sensory signals . Introspection

6528-460: Is now called Stoicism. The Stoics provided a unified account of the world, constructed from ideals of logos , physics , and ethics . Chrysippus , the third head of the school, developed a system that became known as Stoic logic and included a deductive system, Stoic Syllogistic, which was considered a rival to Aristotle's Syllogistic (see: Syllogism ). The Stoics held that all beings (ὄντα)—though not all things (τινά)—are material . Besides

6664-497: Is one of the main branches of philosophy besides fields like ethics , logic , and metaphysics . The term is also used in a slightly different sense to refer not to the branch of philosophy but to a particular position within that branch, as in Plato 's epistemology and Immanuel Kant 's epistemology. As a normative field of inquiry, epistemology explores how people should acquire beliefs. This way, it determines which beliefs fulfill

6800-417: Is only through reason that we gain clear comprehension and conviction ( katalepsis ). Certain and true knowledge ( episteme ), achievable by the Stoic sage, can be attained only by verifying the conviction with the expertise of one's peers and the collective judgment of humankind. According to the Stoics, the Universe is a material reasoning substance ( logos ), which was divided into two classes:

6936-443: Is red, it would be because some part of a universal red body had entered the object. The Stoics propounded that knowledge can be attained through the use of reason . Truth can be distinguished from fallacy —even if, in practice, only an approximation can be made. According to the Stoics, the senses constantly receive sensations: pulsations that pass from objects through the senses to the mind , where they leave an impression in

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7072-408: Is relative since it depends on other beliefs. Further theories of truth include pragmatist , semantic , pluralist , and deflationary theories . Truth plays a central role in epistemology as a goal of cognitive processes and a component of propositional knowledge. In epistemology, justification is a property of beliefs that fulfill certain norms about what a person should believe. According to

7208-407: Is relevant to many descriptive and normative disciplines, such as the other branches of philosophy and the sciences, by exploring the principles of how they may arrive at knowledge. The word epistemology comes from the ancient Greek terms ἐπιστήμη (episteme, meaning knowledge or understanding ) and λόγος (logos, meaning study of or reason ), literally, the study of knowledge. The word

7344-412: Is reliable if most of the beliefs it causes are true. A slightly different view focuses on beliefs rather than belief-formation processes, saying that a belief is justified if it is a reliable indicator of the fact it presents. This means that the belief tracks the fact: the person believes it because it is a fact but would not believe it otherwise. Virtue epistemology is another type of externalism and

7480-420: Is sometimes understood as a form of reliabilism. It says that a belief is justified if it manifests intellectual virtues. Intellectual virtues are capacities or traits that perform cognitive functions and help people form true beliefs. Suggested examples include faculties like vision, memory, and introspection. In the epistemology of perception, direct and indirect realists disagree about the connection between

7616-405: Is synthetically true because its truth depends on the color of snow in addition to the meanings of the words snow and white . A priori knowledge is primarily associated with analytic sentences while a posteriori knowledge is primarily associated with synthetic sentences. However, it is controversial whether this is true for all cases. Some philosophers, such as Willard Van Orman Quine , reject

7752-462: Is taken by radical skeptics , who argue that there is no knowledge at all. Epistemologists distinguish between different types of knowledge. Their primary interest is in knowledge of facts, called propositional knowledge . It is a theoretical knowledge that can be expressed in declarative sentences using a that-clause, like "Ravi knows that kangaroos hop". For this reason, it is also called knowledge-that . Epistemologists often understand it as

7888-399: Is that prolepsis (preconceptions) are general concepts which allow particular things to be recognised, and that these emerge from repeated experiences of similar things. When we form judgments about things ( hupolepsis ), they can be verified and corrected through further sensory information. For example, if someone sees a tower from far away that appears to be round, and upon approaching

8024-456: Is that which lacks the object it seeks. Therefore, the philosopher does not have the wisdom sought, while the sage, on the other hand, does not love or seek wisdom, for it is already possessed. Socrates then examines the two categories of persons who do not partake in philosophy: The position of the philosopher is between these two groups. The philosopher is not wise, but possesses the self-awareness of lacking wisdom, and thus pursues it. Plato

8160-416: Is the dream argument . It starts from the observation that, while people are dreaming, they are usually unaware of this. This inability to distinguish between dream and regular experience is used to argue that there is no certain knowledge since a person can never be sure that they are not dreaming. Some critics assert that global skepticism is a self-refuting idea because denying the existence of knowledge

8296-421: Is the branch of philosophy that examines the nature, origin, and limits of knowledge . Also called theory of knowledge , it explores different types of knowledge, such as propositional knowledge about facts, practical knowledge in the form of skills, and knowledge by acquaintance as a familiarity through experience. Epistemologists study the concepts of belief , truth , and justification to understand

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8432-414: Is the case if the beliefs are consistent and support each other. According to coherentism, justification is a holistic aspect determined by the whole system of beliefs, which resembles an interconnected web. The view of foundherentism is an intermediary position combining elements of both foundationalism and coherentism. It accepts the distinction between basic and non-basic beliefs while asserting that

8568-405: Is the question of whether knowledge is more valuable than a mere opinion that is true. Knowledge and true opinion often have a similar usefulness since both are accurate representations of reality. For example, if a person wants to go to Larissa , a true opinion about how to get there may help them in the same way as knowledge does. Plato already considered this problem and suggested that knowledge

8704-429: Is to have a happiness which is self-contained. There would be nothing to fear—for unreason is the only evil; no cause for anger—for others cannot harm you. The wise person ( sophos ) is someone who is free from the passions ( apatheia ). Instead the sage experiences good-feelings ( eupatheia ) which are clear-headed. These emotional impulses are not excessive, but nor are they diminished emotions. Instead they are

8840-493: Is unclear from the surviving evidence how much of its doctrines comprise a revival of older doctrines rather than a development of new ones. Pyrrhonists dispute that the dogmatists – which includes all of Pyrrhonism's rival philosophies – have found truth regarding non-evident matters. For any non-evident matter, a Pyrrhonist makes arguments for and against such that the matter cannot be concluded, thus suspending belief and thereby inducing ataraxia. Although Pyrrhonism's objective

8976-427: Is wet. According to foundationalism, basic beliefs are the foundation on which all other knowledge is built while non-basic beliefs constitute the superstructure resting on this foundation. Coherentists reject the distinction between basic and non-basic beliefs, saying that the justification of any belief depends on other beliefs. They assert that a belief must be in tune with other beliefs to amount to knowledge. This

9112-407: Is what distinguishes justified beliefs from superstition and lucky guesses. However, justification does not guarantee truth. For example, if a person has strong but misleading evidence, they may form a justified belief that is false. Epistemologists often identify justification as one component of knowledge. Usually, they are not only interested in whether a person has a sufficient reason to hold

9248-601: Is white or that God exists . In epistemology, they are often understood as subjective attitudes that affirm or deny a proposition , which can be expressed in a declarative sentence . For instance, to believe that snow is white is to affirm the proposition "snow is white". According to this view, beliefs are representations of what the world is like. They are kept in memory and can be retrieved when actively thinking about reality or when deciding how to act. A different view understands beliefs as behavioral patterns or dispositions to act rather than as representational items stored in

9384-570: The Stoa Poikile ( Ancient Greek : ἡ ποικίλη στοά), or "painted porch", a colonnade decorated with mythic and historical battle scenes on the north side of the Agora in Athens where Zeno of Citium and his followers gathered to discuss their ideas. Zeno's most influential follower was Chrysippus , who followed him as leader of the school after Cleanthes , and was responsible for molding what

9520-707: The Stoics , the Epicureans and the Skeptics . The Preceding classical period in Ancient Greek philosophy had centered around Socrates (c. 470–399 BC), whose students Antisthenes , Aristippus , and Plato went on to found Cynicism , Cyrenaicism , and Platonism , respectively. Plato taught Aristotle who created the Peripatetic school and in turn, had tutored Alexander the Great . Socrates' thought

9656-449: The imagination ( phantasiai ) (an impression arising from the mind was called a phantasma). The mind has the ability to judge (συγκατάθεσις, synkatathesis )—approve or reject—an impression, enabling it to distinguish a true representation of reality from one that is false. Some impressions can be assented to immediately, but others can achieve only varying degrees of hesitant approval, which can be labeled belief or opinion ( doxa ). It

9792-543: The knowledge base of an expert system . Knowledge contrasts with ignorance , which is often simply defined as the absence of knowledge. Knowledge is usually accompanied by ignorance since people rarely have complete knowledge of a field, forcing them to rely on incomplete or uncertain information when making decisions. Even though many forms of ignorance can be mitigated through education and research, there are certain limits to human understanding that are responsible for inevitable ignorance. Some limitations are inherent in

9928-436: The suspension of belief to achieve a state of tranquility . Overall, not many epistemologists have explicitly defended global skepticism. The influence of this position derives mainly from attempts by other philosophers to show that their theory overcomes the challenge of skepticism. For example, René Descartes used methodological doubt to find facts that cannot be doubted. One consideration in favor of global skepticism

10064-469: The Dialectical school played an important role in the development of logic, which was an important precursor of Stoic logic . Stoicism was founded by Zeno of Citium in the 3rd century BC, asserting that the goal of life was to live in accordance with Nature . It advocated the development of self-control and fortitude as a means of overcoming destructive emotions . The name Stoicism derives from

10200-623: The active and the passive. The passive substance is matter, which "lies sluggish, a substance ready for any use, but sure to remain unemployed if no one sets it in motion". The active substance is an intelligent aether or primordial fire , which acts on the passive matter. Everything is subject to the laws of Fate, for the Universe acts according to its own nature, and the nature of the passive matter it governs. The souls of humans and animals are emanations from this primordial Fire, and are, likewise, subject to Fate. Individual souls are perishable by nature, and can be "transmuted and diffused, assuming

10336-454: The apparent antagonism between Platonism and Stoicism was because they were arguing from different points of view. From this syncretism emerged the eclectic middle Platonism of Antiochus of Ascalon . Pyrrhonism was revived by Aenesidemus in the 1st century BC. Its objective is ataraxia (being mentally unperturbed), which is achieved through epoché (i.e. suspension of judgment ) about non-evident matters (i.e., matters of belief ). It

10472-419: The belief following it and is supported by the belief preceding it. The disagreement between internalism and externalism is about the sources of justification. Internalists say that justification depends only on factors within the individual. Examples of such factors include perceptual experience, memories, and the possession of other beliefs. This view emphasizes the importance of the cognitive perspective of

10608-430: The belief in the right way. Another theory states that the belief is the product of a reliable belief formation process. Further approaches require that the person would not have the belief if it was false, that the belief is not inferred from a falsehood, that the justification cannot be undermined , or that the belief is infallible. There is no consensus on which of the proposed modifications and reconceptualizations

10744-522: The circumstances under which they observed the cup. Evidentialism is an influential internalist view. It says that justification depends on the possession of evidence . In this context, evidence for a belief is any information in the individual's mind that supports the belief. For example, the perceptual experience of rain is evidence for the belief that it is raining. Evidentialists have suggested various other forms of evidence, including memories, intuitions, and other beliefs. According to evidentialism,

10880-525: The communal aspect of knowledge and historical epistemology examines its historical conditions. Epistemology is closely related to psychology , which describes the beliefs people hold, while epistemology studies the norms governing the evaluation of beliefs. It also intersects with fields such as decision theory , education , and anthropology . Early reflections on the nature, sources, and scope of knowledge are found in ancient Greek , Indian , and Chinese philosophy . The relation between reason and faith

11016-445: The correct rational emotions. The Stoics listed the good-feelings under the headings of joy ( chara ), wish ( boulesis ), and caution ( eulabeia ). Thus if something is present which is a genuine good, then the wise person experiences an uplift in the soul—joy ( chara ). Epicureanism was founded by Epicurus in the 3rd century BC. Epicurean physics held that the entire universe consisted of two things: matter and void. Matter

11152-405: The distinction, saying that there are no analytic truths. The analysis of knowledge is the attempt to identify the essential components or conditions of all and only propositional knowledge states. According to the so-called traditional analysis , knowledge has three components: it is a belief that is justified and true. In the second half of the 20th century, this view was put into doubt by

11288-460: The doctrine of a divine superintending providence. Even if there were orderly connexion of parts in the universe , this may have resulted quite naturally. No proof can be advanced to show that this world is anything but the product of natural forces. Knowledge being impossible, a wise man should practice epoche (suspension of judgment). He will not even be sure that he can be sure of nothing. He saved himself, however, from absolute skepticism by

11424-502: The doctrine of plausibility, which may serve as a practical guide in life. Ideas or notions are never true, but only plausible; nevertheless, there are degrees of plausibility, and hence degrees of belief, leading to action. According to Carneades, an impression may be plausible in itself; plausible and uncontradicted (not distracted by synchronous sensations, but shown to be in harmony with them) when compared with others; plausible, uncontradicted, and thoroughly investigated and confirmed. In

11560-508: The existence of truth ; they just doubted that humans had the capacities for obtaining it. They based this position on Plato 's Phaedo , in which Socrates discusses how knowledge is not accessible to mortals. Up to Arcesilaus , the Platonic Academy had accepted the principle of finding a general unity in all things, by the aid of which a principle of certainty might be found. Arcesilaus, however, broke new ground by attacking

11696-431: The existing beings they admitted four incorporeals (asomata): time, place, void, and sayable. They were held to be just 'subsisting' while such a status was denied to universals. Thus, they accepted Anaxagoras 's idea (as did Aristotle) that if an object is hot, it is because some part of a universal heat body had entered the object. But, unlike Aristotle, they extended the idea to cover all accidents . Thus, if an object

11832-1006: The external world. This interest in using philosophy to improve life was captured in Epicurus ' claim that "empty are the words of that philosopher who offers therapy for no human suffering". Many of the Socratic schools founded prior to the Hellenistic period continued to exert influence well into it, including the Cynic, Cyrenaic and Megarian school. Cynicism, as begun with Antisthenes, followed by Diogenes and Crates of Thebes , advocated purposefully living an ascetic life with only bare necessities in accordance with nature , rejecting all "unnatural pleasures" that were associated with society or its material benefits. Pleasures provided by nature (which would be immediately accessible) were acceptable, however. Crates hence claimed that "Philosophy

11968-425: The first degree there is a strong persuasion of the propriety of the impression made; the second and third degrees are produced by comparisons of the impression with others associated with it, and an analysis of itself. Carneades left no written works; his opinions seem to have been systematized by his pupil Clitomachus , whose works, which included one " on suspension of judgment ," were made use of by Cicero . By

12104-411: The form of knowledge-how and knowledge by acquaintance . Knowledge-how is a practical ability or skill, like knowing how to read or how to prepare lasagna . It is usually tied to a specific goal and not mastered in the abstract without concrete practice. To know something by acquaintance means to be familiar with it as a result of experiental contact. Examples are knowing the city of Perth , knowing

12240-472: The future and regrets of the past, leaving one at peace of mind. These ideas were taken further by Anniceris (fl. 300 BC), who expanded pleasure to include things like friendship and honour. Theodorus (c. 340–250) disagreed with this, and instead argued that social ties should be cut and self-sufficiency be espoused instead. Hegesias of Cyrene (fl. 290) on the other hand claimed that life could ultimately not be overall pleasurable. The dialectical school

12376-427: The human cognitive faculties themselves, such as the inability to know facts too complex for the human mind to conceive. Others depend on external circumstances when no access to the relevant information exists. Epistemologists disagree on how much people know, for example, whether fallible beliefs about everyday affairs can amount to knowledge or whether absolute certainty is required. The most stringent position

12512-417: The individual in the form of their mental states. It is commonly associated with the idea that the relevant factors are accessible, meaning that the individual can become aware of their reasons for holding a justified belief through introspection and reflection. Externalism rejects this view, saying that at least some relevant factors are external to the individual. This means that the cognitive perspective of

12648-405: The individual is less central while other factors, specifically the relation to truth, become more important. For instance, when considering the belief that a cup of coffee stands on the table, externalists are not only interested in the perceptual experience that led to this belief but also consider the quality of the person's eyesight, their ability to differentiate coffee from other beverages, and

12784-448: The infinity of space, time, and the multiple worlds." According to Seneca the Younger , Epicurus believed that the sage rarely gets married, because marriage is accompanied by many inconveniences. Léon Robin , in his commentary on Lucretius , writes "the sage places himself within the immutability of eternal Nature, which is independent of time." It is the view of Zeno and his Stoic followers that there are two races of men, that of

12920-405: The justification of non-basic beliefs depends on coherence with other beliefs. Infinitism presents another approach to the structure of knowledge. It agrees with coherentism that there are no basic beliefs while rejecting the view that beliefs can support each other in a circular manner . Instead, it argues that beliefs form infinite justification chains, in which each link of the chain supports

13056-440: The main topic in epistemology, some theorists focus on understanding rather than knowledge. Understanding is a more holistic notion that involves a wider grasp of a subject. To understand something, a person requires awareness of how different things are connected and why they are the way they are. For example, knowledge of isolated facts memorized from a textbook does not amount to understanding. According to one view, understanding

13192-457: The mind possesses inborn ideas which it can access without the help of the senses. Others hold that there is an additional cognitive faculty, sometimes called rational intuition , through which people acquire nonempirical knowledge. Some rationalists limit their discussion to the origin of concepts, saying that the mind relies on inborn categories to understand the world and organize experience. Foundationalists and coherentists disagree about

13328-409: The mind. This view says that to believe that there is mineral water in the fridge is nothing more than a group of dispositions related to mineral water and the fridge. Examples are the dispositions to answer questions about the presence of mineral water affirmatively and to go to the fridge when thirsty. Some theorists deny the existence of beliefs, saying that this concept borrowed from folk psychology

13464-479: The nature of knowledge. To discover how knowledge arises, they investigate sources of justification, such as perception , introspection , memory , reason , and testimony . The school of skepticism questions the human ability to attain knowledge while fallibilism says that knowledge is never certain. Empiricists hold that all knowledge comes from sense experience, whereas rationalists believe that some knowledge does not depend on it. Coherentists argue that

13600-417: The need to keep an open and inquisitive mind since doubt can never be fully excluded, even for well-established knowledge claims like thoroughly tested scientific theories. Epistemic relativism is a related view. It does not question the existence of knowledge in general but rejects the idea that there are universal epistemic standards or absolute principles that apply equally to everyone. This means that what

13736-410: The objects perceived. All our sensations are relative, and acquaint us, not with things as they are, but only with the impressions that things produce upon us. Experience, he said, clearly shows that there is no true impression. There is no notion that may not deceive us; it is impossible to distinguish between false and true impressions; therefore the Stoic phantasia kataleptike must be given up. There

13872-456: 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 a manner that caused the viewer to experience the color red. The atoms are not perceived individually, but rather as

14008-453: The perceiver and the perceived object. Direct realists say that this connection is direct, meaning that there is no difference between the object present in perceptual experience and the physical object causing this experience. According to indirect realism, the connection is indirect since there are mental entities, like ideas or sense data, that mediate between the perceiver and the external world. The contrast between direct and indirect realism

14144-506: The primary advocate of skepticism dating from around 266 BC, Arcesilaus became its head, until the mid-first century BCE. While early Academic skepticism was influenced in part by Pyrrho, it grew more and more dogmatic until Aenesidemus , in the first century BCE, broke with the Academic skeptics and adopted Pyrrhonism, denouncing the Academy as " Stoics fighting against Stoics." The Academic skeptics maintained that knowledge of things

14280-446: The realm of the divine Mind. Epicurus believed that one would achieve ataraxia by intense study and examination of Nature . This sage would be like the gods and would "[watch] the infinity of worlds arising out of atoms in the infinite void" and because of this nothing ever disturbs the peace of his soul. Certainly, they would be "unconcerned by mundane affairs in their bright, eternal tranquility, they spend their time contemplating

14416-400: The root of each passion. Incorrect judgement as to a present good gives rise to delight (hēdonē), while lust (epithumia) is a wrong estimate about the future. Unreal imaginings of evil cause distress (lupē) about the present, or fear (phobos) for the future. The ideal Stoic would instead measure things at their real value, and see that the passions are not natural. To be free of the passions

14552-506: The sage The difficulty of becoming a sage was often discussed in Stoicism. When Panaetius , the seventh and final scholarch of the Stoa, was asked by a young man whether a sage would fall in love, he responded by saying: "As to the wise man, we shall see. What concerns you and me, who are still a great distance from the wise man, is to ensure that we do not fall into a state of affairs which

14688-468: The sage are propounded to be how a god would act in the same situation. What more accurate stand or measure of good things do we have than the Sage? In Plato 's Symposium Socrates says the difference between a sage and a philosopher ( Ancient Greek : φιλόσοφος , meaning lover of wisdom ) was that the sage has what the philosopher seeks. While analyzing the concept of love , Socrates concludes love

14824-625: The sage as one "who has knowledge of the beginning and the end, and of that all-pervading Reason which orders the universe in its determinate cycles to the end of time". Hellenistic philosophy Hellenistic philosophy is Ancient Greek philosophy corresponding to the Hellenistic period in Ancient Greece , from the death of Alexander the Great in 323 BC to the Battle of Actium in 31 BC. The dominant schools of this period were

14960-456: The sage, while the circumstances of life sought by other people (good health, wealth, praise, fame, long life, etc.) were regarded by the Stoic sage as unnecessary externals. This indifference to externals was achieved by the sage through the correct knowledge of impressions, a core concept in Stoic epistemology . Thus, the sage's happiness, eudaimonia , was based entirely on virtue . 'If thou wouldst know contentment, let thy deeds be few,' said

15096-435: 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 . Epicureans believed that senses also relied on atoms. Every object was continually emitting particles from itself that would then interact with

15232-644: The sense data it receives from the sensory organs. According to them, the mind can arrive at various additional insights by comparing impressions, combining them, generalizing to arrive at more abstract ideas, and deducing new conclusions from them. Empiricists say that all these mental operations depend on material from the senses and do not function on their own. Even though rationalists usually accept sense experience as one source of knowledge, they also say that important forms of knowledge come directly from reason without sense experience, like knowledge of mathematical and logical truths. According to some rationalists,

15368-452: The shipping of Aristotle's manuscripts to Rome. The end of the Hellenistic period does not correspond with anything philosophical but gradually during the Roman imperial period the predominance of Ancient Roman philosophy becomes perceptible. According to A. C. Grayling , the greater insecurity and loss of autonomy of the era drove some to use philosophy as a means to seek inner security from

15504-445: The skepticism which was latent in the later writings of Plato . Arcesilaus held that strength of intellectual conviction cannot be regarded as valid, inasmuch as it is characteristic equally of contradictory convictions. The uncertainty of sense data applies equally to the conclusions of reason, and therefore man must be content with probability which is sufficient as a practical guide. "We know nothing, not even our ignorance"; therefore

15640-411: The standards or epistemic goals of knowledge and which ones fail, thereby providing an evaluation of beliefs. Descriptive fields of inquiry, like psychology and cognitive sociology , are also interested in beliefs and related cognitive processes. Unlike epistemology, they study the beliefs people have and how people acquire them instead of examining the evaluative norms of these processes. Epistemology

15776-458: The state of the soul itself; in wisdom and self-control. One must therefore strive to be free of the passions . For the Stoics, reason meant using logic and understanding the processes of nature—the logos or universal reason, inherent in all things. For the Stoics, passions are evaluative judgements; A person experiencing such an emotion has incorrectly valued an indifferent thing. a fault of judgement, some false notion of good or evil, lies at

15912-407: The structure of knowledge. Foundationalism distinguishes between basic and non-basic beliefs. A belief is basic if it is justified directly, meaning that its validity does not depend on the support of other beliefs. A belief is non-basic if it is justified by another belief. For example, the belief that it rained last night is a non-basic belief if it is inferred from the observation that the street

16048-399: 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 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

16184-421: The taste of tsampa , and knowing Marta Vieira da Silva personally. Another influential distinction is between a posteriori and a priori knowledge. A posteriori knowledge is knowledge of empirical facts based on sensory experience, like seeing that the sun is shining and smelling that a piece of meat has gone bad. Knowledge belonging to the empirical science and knowledge of everyday affairs belongs to

16320-424: The time of Philo of Larissa , we find a tendency not only to reconcile the internal divergences of the Academy itself, but also to connect it with parallel systems of thought. In general, his philosophy was a reaction against the skeptic or agnostic position of the middle and new Academy in favor of the dogmatism of Plato. Philo of Larissa endeavored to show that Carneades was not opposed to Plato, and further that

16456-421: 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. 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

16592-409: The truth. More specifically, this and similar counterexamples involve some form of epistemic luck, that is, a cognitive success that results from fortuitous circumstances rather than competence. Following these thought experiments , philosophers proposed various alternative definitions of knowledge by modifying or expanding the traditional analysis. According to one view, the known fact has to cause

16728-476: The two extremes of the too much and the too little. The Hellenistic period began with the death of Alexander and Diogenes in 323 BC, followed by the death of Aristotle the next year in 322 BC. While the classical thinkers were mostly based in Athens , at end of the Hellenistic period philosophers relocated at Rome or Alexandria. The shift followed Rome's military victories from the middle of the second century. Sulla 's capture of Athens in 87 led to destructions and

16864-410: 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: When not prevented by other atoms, all atoms move at the same speed naturally downwards in relation to the rest of the world. This downwards motion

17000-400: The validity or truth of a proposition. Certainty, by contrast, is a strong affirmative conviction, meaning that the person is free of doubt that the proposition is true. In epistemology, doubt and certainty play central roles in attempts to find a secure foundation of all knowledge and in skeptical projects aiming to establish that no belief is immune to doubt. While propositional knowledge is

17136-414: The very possibility of certainty. Socrates had said, " This alone I know: that I know nothing ." But Arcesilaus went further and denied the possibility of even the Socratic minimum of certainty: "I cannot know even whether I know or not." The doctrines of Arcesilaus, which must be gathered from the writings of others, represent an attack on the Stoic phantasia kataleptike (criterion) and are based on

17272-498: The wise man will be content with an agnostic attitude. The next stage in Academic skepticism was the moderate skepticism of Carneades , which he said owed its existence to his opposition to Chrysippus . To the Stoic theory of perception, the phantasia kataleptike , by which they expressed a conviction of certainty arising from impressions so strong as to amount to science, he proposed the doctrine of acatalepsia , which denied any necessary correspondence between perceptions and

17408-405: The world. While this core sense is of particular interest to epistemologists, the term also has other meanings. Understood on a social level, knowledge is a characteristic of a group of people that share ideas, understanding, or culture in general. The term can also refer to information stored in documents, such as "knowledge housed in the library" or knowledge stored in computers in the form of

17544-546: The worthwhile, and that of the worthless. The race of the worthwhile employ the virtues through all of their lives, while the race of the worthless employ the vices. Hence the worthwhile always do the right thing on which they embark, while the worthless do wrong. The concept of the sage within Stoicism was an important topic. Indeed, the discussion of Stoic ethics within Stobaeus , which depended on Arius Didymus , spent over

17680-434: Was a central topic in the medieval period . The modern era was characterized by the contrasting perspectives of empiricism and rationalism. Epistemologists in the 20th century examined the components, structure, and value of knowledge while integrating insights from the natural sciences and linguistics . Epistemology is the philosophical study of knowledge . Also called theory of knowledge , it examines what knowledge

17816-497: Was an attempt to establish the Jewish religious tradition within the culture and language of Hellenism . Its principal representative was Philo of Alexandria .(30 BC – 45 AD) Pythagorean views were revived by Nigidius Figulus during the Hellenistic period, when pseudo-pythagorean writings began circulating. Eventually in the 1st and 2nd centuries AD Neopythagoreanism came to be recognized. Epistemology Epistemology

17952-402: Was composed of philosophers who maintained and developed the philosophy of Aristotle after his death, beginning with Theophrastus (371–287 BC) and Strato of Lampsacus (335–269 BC). They advocated examination of the world to understand the ultimate foundation of things. The goal of life was the eudaimonia which originated from virtuous actions, which consisted in keeping the mean between

18088-552: 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 . 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 ) Hellenistic Judaism

18224-578: Was known for their study of paradoxes , dialectic , and propositional logic. The main philosophers associated with this school were Diodorus Cronus and Philo the Logician Besides studying logical puzzles and paradoxes, the Dialecticians made two important logical innovations, by re-examining modal logic , and by starting an important debate on the nature of conditional statements . Through their development of propositional logic ,

18360-454: Was only coined in the 19th century to label this field and conceive it as a distinct branch of philosophy. Knowledge is an awareness, familiarity, understanding, or skill. Its various forms all involve a cognitive success through which a person establishes epistemic contact with reality. Knowledge is typically understood as an aspect of individuals, generally as a cognitive mental state that helps them understand, interpret, and interact with

18496-454: Was therefore influential for many of these schools of the period, leading them to focus on ethics and how to reach eudaimonia . Early Platonism, known as the "Old Academy" begins with Plato, followed by Speusippus (Plato's nephew), who succeeded him as the head of 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 . The Peripatetic school

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