310.06

Ἀνὴρ δίκαιός ἐστιν, ουχ ὁ μὴ ἀδικῶν,
ἀλλ' ὅστις ἀδικεῖν δυνάμενος μὴ βούλεται.

Philemon. Fabulae Incertae, Fragment 10.

Not 'honest' he who weakly does no wrong,
But he who will not do it when he's strong. - (F.A. Paley.)