Plato, Laws 788a

γενομένων δὲ παίδων ἀρρένων καὶ θηλειῶν, τροφὴν μέν που καὶ παιδείαν τὸ μετὰ ταῦτα λέγειν ὀρθότατʼ ἂν γίγνοιθʼ ἡμῖν, ἣν εἶναι μὲν ἄρρητον πάντως ἀδύνατον, λεγομένη δὲ διδαχῇ τινι καὶ νουθετήσει μᾶλλον ἢ νόμοις εἰκυῖʼ ἂν ἡμῖν φαίνοιτο. ἰδίᾳ γὰρ καὶ κατʼ οἰκίας πολλὰ καὶ σμικρὰ καὶ οὐκ ἐμφανῆ πᾶσι γιγνόμενα, ῥᾳδίως ὑπὸ τῆς

Now that our children, of both sexes, are born, our proper course will be to deal in the next place with their nurture and education. This is a subject which it is wholly impossible to pass over; but obviously it can be treated more suitably by way of precept and exhortation than by legislation. For in the private life of the family many trivial things are apt to be done which escape general notice,—things which are the result of individual feelings of pain, pleasure, or desire,