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Theaetetus

Written by Plato

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Classical literatureKnowledge, Theory of

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About this book

"The Theaetetus" by Plato is a philosophical dialogue likely written in the late 4th century BC. The work explores the nature of knowledge through an exchange between Socrates, the protagonist, and a young mathematician named Theaetetus, as they dissect various definitions and theories regarding the essence of knowledge. At the start of the dialogue, we learn of Theaetetus's unfortunate condition, having been wounded and brought back from battle, which sets a reflective tone surrounding his potential. Socrates directly engages Theaetetus, leading him in a dialectical examination that begins with the definition of knowledge as "sensible perception," drawing on Protagorean thought. The conversation unfolds into deeper explorations involving perception, opinion, and falsehoods, revealing the complexities behind defining knowledge itself, while showcasing Socrates’s midwifery-like role in drawing out ideas from Theaetetus. This opening section sets the foundation for a rigorous philosophical inquiry that probes the limits of human understanding and cognition.

Reading guide

Themes, characters and key ideas in Theaetetus, written by Chaptra AI.

  • about 10 hours
  • advanced
  • philosophical
  • intellectual
  • analytical

Plato's "Theaetetus" is a profound philosophical dialogue that meticulously investigates the fundamental question: "What is knowledge?" Through the dialectical method, Socrates guides the bright young mathematician Theaetetus in a rigorous examination of three primary definitions: knowledge as sensible perception, knowledge as true judgment (or opinion), and knowledge as true judgment accompanied by an account. Despite exploring various analogies and refuting each proposed definition with incisive logical arguments, the dialogue famously concludes in a state of aporia, without reaching a definitive answer. This sustained inquiry not only showcases Socrates's intellectual 'midwifery' but also lays foundational groundwork for Western epistemology, highlighting the inherent complexities in defining human understanding.

“Socrates: "I am myself a barren woman in point of wisdom, and have brought forth no idea of my own." (Socrates describing his 'midwifery'.)”

Key themes

The Nature of Knowledge (Epistemology)
This is the central, overarching theme of the entire dialogue. Plato, through Socrates, systematically explores what constitutes knowledge, distinguishing it from mere belief or perception. The dialogue examines three main definitions – knowledge as perception, as true judgment, and as true judgment with an account – and rigorously tests their logical coherence, revealing the profound difficulties in arriving at a universally satisfying definition.
Truth and Falsehood
Integral to defining knowledge, the dialogue extensively explores the problem of falsehood. If knowledge is true judgment, then how can false judgment occur? This leads to intricate discussions about how one can mistakenly believe something, how one can hold a false opinion while possessing true knowledge, and the cognitive mechanisms involved in error. The inability to fully account for falsehood is a major reason why 'true judgment' is ultimately rejected as a sufficient definition of knowledge.
The Socratic Method / Dialectic
The dialogue is a quintessential demonstration of Socrates's philosophical method. It showcases his relentless questioning, his feigned ignorance (Socratic irony), and his 'midwifery' approach to drawing out and testing the ideas of his interlocutors. This method aims not necessarily at providing answers, but at exposing ignorance, clarifying concepts, and stimulating critical thought, thus leading to intellectual growth even in a state of aporia.

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Is knowledge truly indefinable, or does the 'Theaetetus' merely demonstrate the inadequacy of the proposed definitions?

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