Plato, Letters 332e

μὴ ταύτῃ δὲ τραπόμενος τἀναντία πάντα ἀποτελεῖ· πορευθεὶς δὲ ὡς λέγομεν, καὶ ἑαυτὸν ἔμφρονά τε καὶ σώφρονα ἀπεργασάμενος, εἰ τὰς ἐξηρημωμένας Σικελίας πόλεις κατοικίσειεν νόμοις τε συνδήσειεν καὶ πολιτείαις, ὥστε αὑτῷ τε οἰκείας καὶ ἀλλήλαις εἶναι πρὸς τὰς τῶν βαρβάρων βοηθείας, οὐ

And if he pursued the course we describe, and made himself right-minded and sober-minded, then, if he were to re-people the devastated cities of Sicily and bind them together by laws and constitutions so that they should be leagued both with himself and with one another against barbarian reinforcements, he would thus not merely double the empire of his father