The things that are, are; and those which are not, are not; and this holds not only here among us, but among all men. Minos, 361 B
Σωκράτης: οὐκοῦν, ὡς κατὰ πάντων εἰπεῖν, τὰ ὄντα νομίζεται εἶναι, οὐ τὰ μὴ ὄντα, καὶπαρ᾽ ἡμῖν καὶ παρὰ τοῖς ἄλλοις ἅπασιν.