Plato, Laws 691a

τὸ μὲν εἰκὸς καὶ τὸ πολύ, βασιλέων τοῦτʼ εἶναι νόσημα ὑπερηφάνως ζώντων διὰ τρυφάς. οὐκοῦν δῆλον ὡς πρῶτον τοῦτο οἱ τότε βασιλῆς ἔσχον, τὸ πλεονεκτεῖν τῶν τεθέντων νόμων, καὶ ὃ λόγῳ τε καὶ ὅρκῳ ἐπῄνεσαν, οὐ συνεφώνησαν αὑτοῖς, ἀλλὰ ἡ διαφωνία, ὡς ἡμεῖς φαμεν, οὖσα ἀμαθία μεγίστη, δοκοῦσα δὲ σοφία, πάντʼ ἐκεῖνα διὰ πλημμέλειαν καὶ ἀμουσίαν τὴν πικρὰν διέφθειρεν; ἔοικε γοῦν.

Probably this is, in the main, a disease of kings, in whom luxury breeds pride of life. Is it not plain that what those kings strove for first was to get the better of the established laws, and that they were not in accord with one another about the pledge which they had approved both by word and by oath; and this discord—reputed to be wisdom, but really, as we affirm, the height of ignorance, owing to its grating dissonance and lack of harmony, brought the whole Greek world to ruin? It would seem so, certainly.