Knowledge
Knowledge is the ancient human attempt to separate what is merely right from what can survive examination, luck, and loss. Philosophy’s long quarrel over that distinction begins with a simple question: when does belief become something more?
Quick Facts
- Period
- 400 BC – present
- Region
- Europe
- Key Figures
- Alvin Goldman, Aristotle, Edmund Gettier +3 more
Key Figures
Alvin Goldman
Interpreter
Contemporary EpistemologyAlvin Goldman is one of the great builders of the post-Gettier landscape. Where Gettier offered a diagnostic shock, Gold...
Aristotle
Developer
Peripatetic SchoolFor Al-Farabi, Aristotle is the First Teacher: the great source of disciplined inquiry, ordered argument, and the confid...
Edmund Gettier
Critic
Analytic PhilosophyEdmund Gettier occupies an unusually small physical space in the history of philosophy and an outsized intellectual one....
Plato
Originator
Classical Greek PhilosophyPlato matters to Al-Farabi not only as the author of the Republic but as the philosopher of the ordered soul and the ord...
René Descartes
Successor
Early Modern PhilosophyRené Descartes is the great nearby ancestor against whom Spinoza’s system takes shape, but to treat him merely as a pred...
Socrates
Interlocutor
Classical Greek PhilosophySocrates survives less as a man than as a method, and that survival is itself revealing. He became the philosopher who t...
The Story
This narrative combines documented history with dramatized scenes for storytelling purposes.
The World That Made It
Knowledge enters philosophy not as a tidy definition but as a crisis of confidence. Long before epistemology became a specialized field, Greek thinkers were alr...
The Central Idea
The most familiar starting point for the philosophy of knowledge is Plato’s Theaetetus, where Socrates and his young interlocutor chase the question “What is kn...
The System
Once the central distinction is in place, the philosophy of knowledge spreads outward into a system. It touches logic, perception, demonstration, memory, testim...
Tensions & Critiques
The most famous modern challenge to the classical picture is the problem of lucky true belief. In 1963, Edmund Gettier published a short paper, “Is Justified Tr...
Legacy & Echoes
The history of knowledge after the classical and Gettier periods is the history of a concept that refuses to stay in one place. It migrates from logic to scienc...
Timeline
Plato’s Theaetetus stages the problem of knowledge
**420 BC** — In the dialogue Theaetetus, Socrates tests and rejects several candidate definitions of knowledge, including perception and true belief. The discussion makes the concept philosophically self-conscious: knowledge is no longer just assumed, but interrogated as a problem.
Plato’s Republic links knowledge to the ascent from opinion
**400 BC** — The Republic contrasts opinion with knowledge through the divided line and cave allegory. Plato presents knowledge as an orientation toward what is stable and intelligible rather than merely visible and changing.
Aristotle develops demonstrative knowledge in the Posterior Analytics
**340 BC** — Aristotle formalizes scientific knowledge as demonstration from first principles and causes. The work becomes foundational for later accounts of explanation, proof, and the structure of inquiry.
Stoic and Skeptical debates sharpen the problem of certainty
**200 BC** — Hellenistic philosophers contest whether impressions can be trusted and whether certainty is possible for human beings. Their arguments force epistemology to address assent, suspension of judgment, and the vulnerability of appearance.
Aquinas integrates knowledge, faith, and reason
**1265** — In the Summa Theologiae, Aquinas distinguishes kinds of assent and clarifies the relation between demonstrable knowledge and faith. Scholastic philosophy gives epistemology a highly articulated place within theology and natural reason.
Descartes publishes the Discourse on Method
**1637** — Descartes proposes methodic doubt as a way to clear away unreliable belief and search for secure foundations. The book inaugurates a new modern obsession with certainty and the grounds of knowledge.
Kant publishes the Critique of Pure Reason
**1781** — Kant rethinks knowledge by asking how experience and objective judgment are possible at all. The work reorients epistemology toward the conditions that make knowledge of nature possible for finite minds.
Gettier publishes the counterexamples
**1963** — Gettier’s short article shows that justified true belief may fail to amount to knowledge because of epistemic luck. The paper becomes one of the most discussed challenges in modern epistemology.
Goldman’s reliabilism expands the theory of knowledge
**1979** — Alvin Goldman argues that knowledge depends on the reliability of belief-forming processes rather than on internal justification alone. This helps redirect epistemology toward externalism and naturalized inquiry.
Virtue epistemology begins to reshape the debate
**1986** — Philosophers such as Ernest Sosa argue that knowledge should be understood through intellectual competence and the credit due to the knower. The shift reconnects epistemology with agency and achievement.
Social epistemology and testimony become central
**2000** — Work by Goldman, Miranda Fricker, and others places knowledge within networks of trust, expertise, and institutional power. The subject expands from solitary justification to the social conditions of knowing.
The digital public sphere intensifies the problem of epistemic trust
**2010** — The spread of algorithmically curated information makes the distinction between knowledge and merely persuasive content newly urgent. Philosophical questions about truth, reliability, and authority become everyday civic problems.
Sources
- primary_textPlato, Theaetetus
Standard philosophical source for the classical problem of knowledge.
- primary_textPlato, Republic
Includes the epistemic contrast between opinion and knowledge.
- primary_textAristotle, Posterior Analytics
Background on Aristotle's theory of demonstration and scientific knowledge.
- reference_workEpistemology
Stanford Encyclopedia overview of the field and its central problems.
- reference_workKnowledge
Internet Encyclopedia of Philosophy overview of theories of knowledge.
- primary_textEdmund Gettier, 'Is Justified True Belief Knowledge?'
The classic 1963 counterexample paper.
- scholarly_bookAlvin I. Goldman, Epistemology and Cognition
Key work in reliabilist epistemology.
- scholarly_bookAlvin I. Goldman, Knowledge in a Social World
Major work on testimony and social epistemology.
- scholarly_bookErnest Sosa, Knowledge in Perspective
Foundational text in virtue epistemology.
- scholarly_bookDuncan Pritchard, What Is This Thing Called Knowledge?
Accessible contemporary introduction to the problem of knowledge.
Explore Related Archives
The philosophies documented here connect to the broader record. Explore the context through our sister archives.
