ὀρθῶς φρονεῖν

From LSJ

αἱ δὲ χολωσάμεναι πηρὸν θέσαν → but they in their wrath maimed him, but they in their wrath made him helpless, but they in their wrath made him blind

Source

Greek > English (Woodhouse)

be sane, be sensible, be wise