Plato, Letters 351a

καίτοι τήν γε αὐτὴν δίων εἶχεν βούλησιν ἥνπερ ἂν ἐγὼ φαίην δεῖν ἐμὲ καὶ ἄλλον, ὅστις μέτριος, περί τε τῆς αὑτοῦ δυνάμεως καὶ φίλων καὶ περὶ πόλεως τῆς αὑτοῦ διανοοῖτʼ ἂν εὐεργετῶν ἐν δυνάμει καὶ τιμαῖσιν γενέσθαι τὰ μέγιστα ἐν ταῖς μεγίσταις. ἔστιν δὲ οὐκ ἄν τις πλούσιον ἑαυτὸν ποιήσῃ καὶ ἑταίρους καὶ πόλιν, ἐπιβουλεύσας καὶ συνωμότας συναγαγών, πένης ὢν καὶ ἑαυτοῦ μὴ κρατῶν, ὑπὸ δειλίας τῆς πρὸς τὰς ἡδονὰς ἡττημένος,

And yet Dion had the same designs as I myself should have had (for so I would maintain) or anyone else whose purpose regarding his own power and his friends and his city was the reasonable one of achieving the greatest height of power and privilege by conferring the greatest benefits. But a man does not do this if he enriches himself, his comrades, and his city by means of plotting and collecting conspirators, while in reality he himself is poor and not his own master but the cowardly slave of pleasures;