ὀρθῶς φρονέω

From LSJ

δι' ἐμοῦ βασιλεῖς βασιλεύουσιν, καὶ οἱ δυνάσται γράφουσιν δικαιοσύνην → through me kings rule, and princes dictate justice (Proverbs 8:15, LXX version)

Source

Greek > English (Woodhouse)

be sane, be sensible, be wise