do one a good turn

From LSJ

θεοὶ μὲν γὰρ μελλόντων, ἄνθρωποι δὲ γιγνομένων, σοφοὶ δὲ προσιόντων αἰσθάνονται → because gods perceive future things, men what is happening now, but wise men perceive approaching things

Source

English > Greek (Woodhouse Extra)

εὖ ποιεῖν, εὖ δρᾶν