Plato, Laws 744c

μηδὲ κατὰ σωμάτων ἰσχῦς καὶ εὐμορφίας, ἀλλὰ καὶ κατὰ πλούτου χρῆσιν καὶ πενίαν, τὰς τιμάς τε καὶ ἀρχὰς ὡς ἰσαίτατα τῷ ἀνίσῳ συμμέτρῳ δὲ ἀπολαμβάνοντες μὴ διαφέρωνται. τούτων χάριν τέτταρα μεγέθει τῆς οὐσίας τιμήματα ποιεῖσθαι χρεών, πρώτους καὶ δευτέρους καὶ τρίτους καὶ τετάρτους, ἤ τισιν ἄλλοις προσαγορευομένους ὀνόμασιν, ὅταν τε μένωσιν ἐν τῷ αὐτῷ τιμήματι καὶ ὅταν πλουσιώτεροι ἐκ πενήτων καὶ ἐκ πλουσίων πένητες γιγνόμενοι

and comeliness, but in proportion also to his wealth or poverty,—so that by a rule of symmetrical inequality they may receive offices and honors as equally as possible, and may have no quarrelling. For these reasons we must make four classes, graded by size of property, and called first, second, third and fourth (or by some other names) , alike when the individuals remain in the same class and when, through a change from poverty to wealth or from wealth to poverty, they pass over each to that class to which he belongs.