Nothing worth doing is completed in our lifetime; therefore, we are saved by hope. Nothing true or beautiful or good makes complete sense in any immediate context of history; therefore, we are saved by faith. Nothing we do, however virtuous, can be accomplished alone; therefore, we are saved by love. No virtuous act is quite as virtuous from the standpoint of our friend or foe as it is from our standpoint. Therefore, we are saved by the final form of love which is forgiveness.
-- Reinhold Niebuhr, The Irony of American History (h/t)