Plato, Laws 919c

τὴν δὲ λύπαις προτετραμμένην εἰς ἀναισχυντίαν αὐτήν. τίς οὖν δὴ τῆς νόσου ταύτης ἀρωγὴ γίγνοιτʼ ἂν ἐν νοῦν ἐχούσῃ πόλει; πρῶτον μὲν ὅτι σμικροτάτῳ χρῆσθαι κατὰ δύναμιν τῷ τῶν καπήλων γένει, ἔπειτα τούτοις τῶν ἀνθρώπων προστάττειν ὧν διαφθειρομένων οὐκ ἂν γίγνοιτο μεγάλη λύμη τῇ πόλει, τρίτον δὲ αὐτοῖς τοῖς μετασχοῦσι τούτων τῶν ἐπιτηδευμάτων εὑρεῖν μηχανὴν ὅπως ἤθη μὴ ἀνέδην

while the other by means of pain plunges it into shamelessness. What remedy, then, is to be found for this disease in a State gifted with understanding? The first is to employ the trading class as little as possible; the second, to assign to that class those men whose corruption would prove no great loss to the State; the third, to find a means whereby the dispositions of those engaged in these callings may not quite so easily become infected