Plato, Laws 644b

μηδαμοῦ ἀτιμάζειν, ὡς πρῶτον τῶν καλλίστων τοῖς ἀρίστοις ἀνδράσιν παραγιγνόμενον· καὶ εἴ ποτε ἐξέρχεται, δυνατὸν δʼ ἐστὶν ἐπανορθοῦσθαι, τοῦτʼ ἀεὶ δραστέον διὰ βίου παντὶ κατὰ δύναμιν. ὀρθῶς, καὶ συγχωροῦμεν ἃ λέγεις. καὶ μὴν πάλαι γε συνεχωρήσαμεν ὡς ἀγαθῶν μὲν ὄντων τῶν δυναμένων ἄρχειν αὑτῶν, κακῶν δὲ τῶν μή. λέγεις ὀρθότατα. σαφέστερον ἔτι τοίνυν ἀναλάβωμεν τοῦτʼ αὐτὸ ὅτι

and that one should in no case disparage education, since it stands first among the finest gifts that are given to the best men; and if ever it errs from the right path, but can be put straight again, to this task every man, so long as he lives, must address himself with all his might. You are right, and we agree with what you say. Further, we agreed long ago that if men are capable of ruling themselves, they are good, but if incapable, bad. Quite true. Let us, then, re-state more clearly