Plato, Laws 641b

τἆλλʼ οὕτω· συμποσίου δὲ ὀρθῶς παιδαγωγηθέντος τί μέγα ἰδιώταις ἢ τῇ πόλει γίγνοιτʼ ἄν; τί δέ; παιδὸς ἑνὸς ἢ καὶ χοροῦ παιδαγωγηθέντος κατὰ τρόπον ἑνός, τί μέγα τῇ πόλει φαῖμεν ἂν γίγνεσθαι; ἢ τοῦτο οὕτως ἐρωτηθέντες εἴποιμεν ἂν ὡς ἑνὸς μὲν βραχύ τι τῇ πόλει γίγνοιτʼ ἂν ὄφελος, εἰ δʼ ὅλως ἐρωτᾷς παιδείαν τῶν παιδευθέντων τί μέγα τὴν πόλιν ὀνίνησιν, οὐ χαλεπὸν εἰπεῖν ὅτι παιδευθέντες μὲν εὖ γίγνοιντʼ ἂν ἄνδρες ἀγαθοί, γενόμενοι

either to individuals or to a State from the right regulation of a wine-party? Well, what great gain should we say would accrue to the State from the right control of one single child or even of one band of children? To the question thus put to us we should reply that the State would benefit but little from one; if, however, you are putting a general question as to what solid advantage the State gains from the education of the educated, then it is quite simple to reply that well-educated men will prove good men, and being good they will conquer their foes in battle,