Plato, Letters 328a

καὶ τὴν αὑτοῦ δύναμιν ἐν αὐτῇ, καὶ τὴν νεότητα καὶ τὴν ἐπιθυμίαν τὴν Διονυσίου, φιλοσοφίας τε καὶ παιδείας ὡς ἔχοι σφόδρα λέγων, τούς τε αὑτοῦ ἀδελφιδοῦς καὶ τοὺς οἰκείους ὡς εὐπαράκλητοι εἶεν πρὸς τὸν ὑπʼ ἐμοῦ λεγόμενον ἀεὶ λόγον καὶ βίον, ἱκανώτατοί τε Διονύσιον συμπαρακαλεῖν, ὥστε εἴπερ ποτὲ καὶ νῦν ἐλπὶς πᾶσα ἀποτελεσθήσεται τοῦ τοὺς αὐτοὺς φιλοσόφους τε καὶ πόλεων ἄρχοντας μεγάλων

in Italy and Sicily and his own power therein, and the youth of Dionysius, mentioning also how great a desire he had for philosophy and education, and he spoke of his own nephews and connections, and how they would be not only easily converted themselves to the doctrines and the life I always taught, but also most useful in helping to influence Dionysius; so that now, if ever (he concluded), all our hopes will be fulfilled of seeing the same persons at once philosophers and rulers of mighty States.