Plato, Euthydemus, Protagoras, Gorgias, Meno, Πρωταγόρας 11:

" καὶ ἐγὼ γιγνώσκων αὐτοῦ τὴν ἀνδρείαν καὶ τὴν πτοίησιν, "τί οὖν σοι," ἦν δ’ ἐγώ, "τοῦτο; μῶν τί σε ἀδικεῖ Πρωταγόρασ; καὶ ὃσ γελάσασ, "νὴ τοὺσ θεούσ," ἔφη, "ὦ Σώκρατεσ, ὅτι γε μόνοσ ἐστὶ σοφόσ, ἐμὲ δὲ οὐ ποιεῖ. " "ἀλλὰ ναὶ μὰ Δία," ἔφην ἐγώ, "ἂν αὐτῷ διδῷσ ἀργύριον καὶ πείθῃσ ἐκεῖνον, ποιήσει καὶ σὲ σοφόν. " "εἰ γάρ," ἦ δ’ ὅσ, "ὦ Ζεῦ καὶ θεοί, ἐν τούτῳ εἰή·