Plato, Laws 752c

μὴ πάνυ σοφῷ, τὸ μὴ ῥᾳδίως γε αὐτοὺς μηδένας προσδέξεσθαι κατʼ ἀρχάς, εἰ δὲ μείναιμέν πως τοσοῦτον χρόνον ἕως οἱ γευσάμενοι παῖδες τῶν νόμων καὶ συντραφέντες ἱκανῶς συνήθεις τε αὐτοῖς γενόμενοι τῶν ἀρχαιρεσιῶν τῇ πόλει πάσῃ κοινωνήσειαν· γενομένου γε μὴν οὗ λέγομεν, εἴπερ τινὶ τρόπῳ καὶ μηχανῇ γίγνοιτο ὀρθῶς, πολλὴν ἔγωγε ἀσφάλειαν οἶμαι καὶ μετὰ τὸν τότε παρόντα χρόνον ἂν γενέσθαι τοῦ μεῖναι τὴν παιδαγωγηθεῖσαν οὕτω πόλιν.

that they will not readily accept any of those laws at the start; but if those laws could remain unchanged until those who have imbibed them in infancy, and have been reared up in them and grown fully used to them, have taken part in elections to office in every department of State,—then, when this has been effected (if any means or method can be found to effect it rightly) , we have, as I think, a strong security that, after this transitional period of disciplined adolescence, the State will remain firm.