Try to move men by persuasion; yet act against their will if the principles of justice so direct. But if someone uses force to obstruct you, then take a different line; resign yourself without a pang, and turn the obstacle into an opportunity for the exercise of some other virtue. Your attempt was always subject to reservations, remember; you were not aiming at the impossible. At what, then? Simply at making the attempt itself. In this you succeeded; and with that the object of your existence is attained.
(Marcus Aurelius, Meditations 6.50, Penguin Classics Translation)