Theaetetus

Theaetetus is one of Plato’s most important works of ancient Greek philosophy, devoted to the fundamental question: What is knowledge? Written as a Socratic dialogue, this classic text explores the nature of truth, perception, belief, and understanding, laying the groundwork for the field of epistemology.

Through a rigorous and engaging conversation between Socrates and the young mathematician Theaetetus, Plato examines and challenges competing definitions of knowledge, including sense perception, true belief, and rational explanation. Rather than offering easy answers, the dialogue models philosophical inquiry itself—showing how careful questioning leads to deeper insight.

Essential reading for students of philosophy, logic, and Western intellectual history, Theaetetus remains central to discussions of knowledge theory, critical thinking, and philosophical method. Its influence extends across philosophy, science, and education, making it a cornerstone of classical philosophy.

Whether read for academic study or personal exploration, Theaetetus offers a timeless introduction to philosophical reasoning and the enduring pursuit of truth.

Why Read Theaetetus

A foundational text on epistemology

Explores truth, perception, and knowledge

Features classic Socratic dialogue

Essential to understanding Plato’s philosophy

Ideal for students and serious readers of philosophy