Plato, Laws 741d

καταστήσουσιν ἐν ταύτῃ τῶν ἀρχῶν ἥτις ἂν ὀξύτατον ὁρᾶν δοκῇ, ἵνα αἱ παρὰ ταῦτα ἑκάστοτε παραγωγαὶ γιγνόμεναι μὴ λανθάνωσιν αὐτούς, ἀλλὰ κολάζωσι τὸν ἀπειθοῦντα ἅμα νόμῳ καὶ τῷ θεῷ. ὅσον γὰρ δὴ τὸ νῦν ἐπιταττόμενον ἀγαθὸν ὂν τυγχάνει πάσαις ταῖς πειθομέναις πόλεσι, τὴν ἑπομένην κατασκευὴν προσλαβόν, κατὰ τὴν παλαιὰν παροιμίαν οὐδεὶς εἴσεταί ποτε κακὸς ὤν, ἀλλʼ ἔμπειρός τε καὶ ἐπιεικὴς ἔθεσι

they shall place the charge of the execution of these matters in the hands of that magistrate who is deemed to be most keen of vision, in order that all breaches of these rules may be brought to their notice, and they may punish the man who disobeys both the law and the god. How great a blessing the ordinance now described—when the appropriate organization accompanies it—proves to all the States that obey it—that is a thing which, as the old proverb says, none that is evil shall know, but only he that has become experienced and practised in virtuous habits.