Plato

Greek · 428–348 BC

Ancient Greek philosopher, student of Socrates and teacher of Aristotle, whose dialogues laid the groundwork for Western philosophy.

Wikipedia ↗

“Ὁ δὲ ἀνεξέταστος βίος οὐ βιωτὸς ἀνθρώπῳ.”

Ancient Greek

“The unexamined life is not worth living.”

Apology ↗ (c. 399 BC)

Spoken by Socrates as recorded by Plato.

“Ἓν οἶδα ὅτι οὐδὲν οἶδα.”

Ancient Greek

“I know that I know nothing.”

Apology ↗ (c. 399 BC)

Spoken by Socrates as recorded by Plato; also known as the Socratic paradox.

“Ἀνδρεία ἐστὶν ἡ τοῦ δεινοῦ καὶ μὴ δεινοῦ ἐπιστήμη.”

Ancient Greek

“Courage is knowing what not to fear.”

Laches ↗ (c. 380 BC)

“The measure of a man is what he does with power.”

English
The Republic ↗ (c. 375 BC)

Modern paraphrase of themes in The Republic; not a direct quotation.

“Δόξα ἄρα μεταξύ ἐστιν ἐπιστήμης καὶ ἀγνοίας.”

Ancient Greek

“Opinion is the medium between knowledge and ignorance.”

The Republic ↗ (c. 375 BC)

“The beginning is the most important part of the work.”

English
The Republic ↗ (c. 375 BC)

Plato expresses this idea in Republic 377a-b. The often-cited Greek "Ἀρχὴ δέ τοι ἥμισυ παντός" is from Hesiod (Works and Days), not Plato.

“Ὃς ἂν μὴ καλῶς δουλεύσῃ, οὐδ᾽ ἂν καλῶς δεσπόσειεν.”

Ancient Greek

“He who is not a good servant will not be a good master.”

Laws ↗ (c. 347 BC)

“Be kind, for everyone you meet is fighting a hard battle.”

English

Widely attributed to Plato but no ancient source confirmed; possibly a modern paraphrase of Philo of Alexandria.

“We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.”

English

This is a modern paraphrase inspired by the Allegory of the Cave; not a direct translation from the Greek. No ancient source confirmed.

“Music gives a soul to the universe, wings to the mind, flight to the imagination and life to everything.”

English

Widely attributed to Plato but no confirmed ancient source; likely a modern composite.