Plato, Laws 773a

φύντι, τοὺς παρὰ τοῖς ἔμφροσιν εὐδόξους γάμους χρὴ γαμεῖν, οἵ σοι παραινοῖεν ἂν μὴ φεύγειν τὸν τῶν πενήτων μηδὲ τὸν τῶν πλουσίων διώκειν διαφερόντως γάμον, ἀλλʼ ἐὰν τἆλλα ἰσάζῃ, τὸν ὑποδεέστερον ἀεὶ τιμῶντα εἰς τὴν κοινωνίαν συνιέναι. τῇ τε γὰρ πόλει σύμφορον ἂν εἴη ταύτῃ ταῖς τε συνιούσαις ἑστίαις· τὸ γὰρ ὁμαλὸν καὶ σύμμετρον ἀκράτου μυρίον διαφέρει πρὸς ἀρετήν. κοσμίων τε πατέρων χρὴ

My child, you must make a marriage that will commend itself to men of sense, who would counsel you neither to shun entirely connection with a poor family, nor to pursue connection with a rich one, but, other things being equal, to prefer always an alliance with a family of moderate means. Such a course will benefit both the State and the united families, since in respect of excellence what is evenly balanced and symmetrical is infinitely superior to what is untempered. The man who knows he is unduly hasty and violent in all his actions should win a bride