Plato, Laws 777a

ἥμισυ γάρ τε νόου , φησίν, ἀπαμείρεται εὐρύοπα Ζεύς ἀνδρῶν, οὓς ἂν δὴ κατὰ δούλιον ἦμαρ ἕλῃσι. ταῦτα δὴ διαλαβόντες ἕκαστοι τοῖς διανοήμασιν οἱ μὲν πιστεύουσί τε οὐδὲν γένει οἰκετῶν, κατὰ δὲ θηρίων φύσιν κέντροις καὶ μάστιξιν οὐ τρὶς μόνον ἀλλὰ πολλάκις ἀπεργάζονται δούλας τὰς ψυχὰς τῶν οἰκετῶν· οἱ δʼ αὖ τἀναντία τούτων δρῶσι πάντα. τί μήν;

declared that—Of half their wits far-thundering Zeus bereaves Those men on whom the day of bondage falls. Thus each party adopts a different attitude of mind: the one places no trust at all in the servant-class, but, treating them like brute beasts, with goads and whips they make the servants’ souls not merely thrice but fifty times enslaved; whereas the other party act in precisely the opposite way. Just so.