I know that I do not know.

ἐγὼ δέ, ὥσπερ οὖν οὐκ οἶδα, οὐδὲ οἴομαι.

Socrates

Quoted in Apology, by Plato

Authentication Score 2

Original Citation

Plato. Apology. 390 BC, 38a5-6.

Current Citation

Plato. "Apology." Plato: Euthyphro, Apology, Crito, Phaedo, Phaedrus. Translated by Harold North Fowler. Harvard UP; Reprint of 1904 ed, 1999, 21d.