Romans 12 (xix)

If we suffer some misfortune, then our passions are roused and our blood begins to boil and in our impatience we start ranting and raving in a state of fury. For it quite naturally upsets us if we have to suffer any form of violence or injustice. That is why we must guard against getting into this state and resist this impulse. You can readily accept that you may get hurt, but it is completely forbidden to take your revenge on this account and cause more damage. That is why you should take care and carefully weigh up the situation in case one right impinges on or even destroys another. Instead, come to an agreement so that both rights will remain. If you cannot implement your own just cause without creating a greater injustice, then leave it be. For it two wrongs can never make one right, and never punish one injustice with another because it is against God's will that the justice pertaining to the whole world should have to be sacrificed on account of your own single right.

The complete Luther - "A Meditation for Each Day of the Year" is available as a biligual (English and German) BREVIARY published by Wartburg Verlag Weimar. It can be purchased in English, world-wide from most internet book shops.