Plato, Meno 94a

δὲ δὴ σκεψώμεθα, Ἀριστείδην τὸν Λυσιμάχου· ἢ τοῦτον οὐχ ὁμολογεῖς ἀγαθὸν γεγονέναι; ἔγωγε, πάντως δήπου. οὐκοῦν καὶ οὗτος τὸν ὑὸν τὸν αὑτοῦ Λυσίμαχον, ὅσα μὲν διδασκάλων εἴχετο, κάλλιστα Ἀθηναίων ἐπαίδευσε, ἄνδρα δὲ βελτίω δοκεῖ σοι ὁτουοῦν πεποιηκέναι; τούτῳ γάρ που καὶ συγγέγονας καὶ ὁρᾷς οἷός ἐστιν. εἰ δὲ βούλει,

Let us take another, Aristeides, son of Lysimachus: do you not admit that he was a good man? I do, absolutely, of course. Well, did he not train his son Lysimachus better than any other Athenian in all that masters could teach him? And in the result, do you consider he has turned out better than anyone else? You have been in his company, I know, and you see what he is like. Or take another example—