Plato, Laws 875b

τιθῆται καλῶς μᾶλλον ἢ τὸ ἴδιον· δεύτερον δέ, ἐὰν ἄρα καὶ τὸ γνῶναί τις ὅτι ταῦτα οὕτω πέφυκεν λάβῃ ἱκανῶς ἐν τέχνῃ, μετὰ δὲ τοῦτο ἀνυπεύθυνός τε καὶ αὐτοκράτωρ ἄρξῃ πόλεως, οὐκ ἄν ποτε δύναιτο ἐμμεῖναι τούτῳ τῷ δόγματι καὶ διαβιῶναι τὸ μὲν κοινὸν ἡγούμενον τρέφων ἐν τῇ πόλει, τὸ δὲ ἴδιον ἑπόμενον τῷ κοινῷ, ἀλλʼ ἐπὶ πλεονεξίαν καὶ ἰδιοπραγίαν ἡ θνητὴ φύσις αὐτὸν ὁρμήσει ἀεί, φεύγουσα μὲν ἀλόγως τὴν λύπην, διώκουσα δὲ τὴν ἡδονήν, τοῦ δὲ

And, secondly, even if a man fully grasps the truth of this as a principle of art, should he afterwards get control of the State and become an irresponsible autocrat, he would never prove able to abide by this view and to continue always fostering the public interest in the State as the object of first importance, to which the private interest is but secondary; rather, his mortal nature will always urge him on to grasping and self-interested action, irrationally avoiding pain