Plato, Laws 666a

ἀναγκαιότατα μέντοι λέγεις. πῶς οὖν αὐτοὺς παραμυθησόμεθα προθύμους εἶναι πρὸς τὰς ᾠδάς; ἆρʼ οὐ νομοθετήσομεν πρῶτον μὲν τοὺς παῖδας μέχρι ἐτῶν ὀκτωκαίδεκα τὸ παράπαν οἴνου μὴ γεύεσθαι, διδάσκοντες ὡς οὐ χρὴ πῦρ ἐπὶ πῦρ ὀχετεύειν εἴς τε τὸ σῶμα καὶ τὴν ψυχήν, πρὶν ἐπὶ τοὺς πόνους ἐγχειρεῖν πορεύεσθαι, τὴν ἐμμανῆ εὐλαβουμένους ἕξιν τῶν νέων· μετὰ δὲ τοῦτο οἴνου μὲν δὴ γεύεσθαι τοῦ μετρίου μέχρι

That is beyond a doubt. How then shall we encourage them to take readily to singing? Shall we not pass a law that, in the first place, no children under eighteen may touch wine at all, teaching that it is wrong to pour fire upon fire either in body or in soul, before they set about tackling their real work, and thus guarding against the excitable disposition of the young? And next, we shall rule that the young man under thirty may take wine in moderation,