“The right way to requite evil, according to Jesus, is not to resist it. This saying of Christ removes the Church from the sphere of politics and law.”

Source: Discipleship (1937), Revenge, p. 141.
Context: The right way to requite evil, according to Jesus, is not to resist it. This saying of Christ removes the Church from the sphere of politics and law. The Church is not to be a national community like the old Israel, but a community of believers without political or national ties. The old Israel had been both — the chosen people of God and a national community, and it was therefore his will that they should meet force with force. But with the Church it is different: it has abandoned political and national status, and therefore it must patiently endure aggression. Otherwise evil will be heaped upon evil. Only thus can fellowship be established and maintained.
At this point it becomes evident that when a Christian meets with injustice, he no longer clings to his rights and defends them at all costs. He is absolutely free from possessions and bound to Christ alone. Again, his witness to this exclusive adherence to Jesus creates the only workable basis for fellowship, and leaves the aggressor for him to deal with.
The only way to overcome evil is to let it run itself to a stand-still because it does not find the resistance it is looking for. Resistance merely creates further evil and adds fuel to the flames. But when evil meets no opposition and encounters no obstacle but only patient endurance, its sting is drawn, and at last it meets an opponent which is more than its match. Of course this can only happen when the last ounce of resistance is abandoned, and the renunciation of revenge is complete. Then evil cannot find its mark, it can breed no further evil, and is left barren.