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Theaetetus (dialogue)

philosophy religion Maturity 9-11 Next article →

The Theaetetus is a famous work written by the philosopher Plato. It was written during the early-middle 4th century BCE. This book is a dialogue, which means it tells a story through conversation.

Salvator Rosa - Démocrite et Protagoras
Salvator Rosa - Démocrite et Protagoras

The main goal of the book is to study the nature of knowledge. Many people call this study epistemology. This is the branch of philosophy that asks how we know things. It is one of the most important founding works in that field.

In the story, Socrates talks with a young mathematician named Theaetetus. They also talk with a teacher named Theodorus of Cyrene.

Tenniel Astrologer
Tenniel Astrologer

Socrates uses a special method to help them think. He compares himself to a midwife. A midwife helps a mother bring a new baby into the world. Socrates says he helps people bring new thoughts into the light. He does this by asking many questions to find the truth.

The group tries to find a single definition for knowledge. They look at three different ideas. First, they ask if knowledge is just what we perceive with our senses. For example, one person might feel cold in the wind while another feels warm. Second, they consider if knowledge is true judgment. Finally, they look at if knowledge is a true judgment with an account.

Tenniel Astrologer
Tenniel Astrologer

Each of these ideas turns out to be unsatisfactory.

Because they cannot find a perfect answer, the dialogue ends in a state called aporia. Aporia is a feeling of being stuck without a solution. The story is framed by a scene involving Euclid of Megara. Euclid and his friend Terpsion see Theaetetus returning from a battle at Corinth. Scholars disagree on the date of this battle. Some say it happened in 369 BC. Others, like Debra Nails, suggest it was actually in 391 BC.

This work has stayed important for a very long time. It influenced many thinkers from the 3rd century BCE through the 6th century CE. Even modern thinkers like Edmund Gettier have looked at it closely. He used Plato's ideas to challenge how we define knowledge today. Socrates also says that wonder belongs to the philosopher. This reminds us that asking big questions is a wonderful thing to do.

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