17. But we must also guard against him who can be seen, and who provokes us, and spurs us on, and exasperates us, and supplies what will excite us to licentiousness or lust. If, then, any one reviles us, irritates, stirs us up to violence, tries to make us quarrel; let us keep silence, let us not be ashamed to become dumb. For he who irritates us and does us an injury is committing sin, and wishes us to become like himself.