Attributed to Plato
«'Let no one ignorant of geometry enter.'»
Misattributed
Verdict
It is not in Plato's work
An inscription attributed to the Academy's door that appears only in sixth-century AD commentators; it is not found in any work of Plato or in sources of his time.
Source: Riginos, Alice Swift, Platonica: The Anecdotes Concerning the Life and Writings of Plato, Leiden, Brill (Columbia Studies in the Classical Tradition 3), 1976.
What they did say
Verified words of Plato
«He knows nothing, and thinks that he knows; I neither know nor think that I know.»
Apología de Sócrates 21d (habla Sócrates). Español: traducción literal propia desde el griego (ed. Burnet). Inglés: Jowett, 1892 (dominio público).
«The unexamined life is not worth living.»
Apología de Sócrates 38a (habla Sócrates). Español: traducción literal propia desde el griego (ed. Burnet). Inglés: Jowett, 1892 (dominio público).
«The hour of departure has arrived, and we go our ways—I to die, and you to live. Which is better God only knows.»
Apología de Sócrates 42a, final del discurso (habla Sócrates). Español: traducción literal propia desde el griego (ed. Burnet). Inglés: Jowett, 1892 (dominio público).