"[On Luther] And yet his faults were his success. He was a man of war because the situation seemed to demand war, because the problems he attacked had for centuries resisted all the methods of peace. His whole life was a battle—against the sense of guilt, against the Devil, the Pope, the Emperor, Zwingli, even against the friends who would have compromised his revolt into a gentlemanly protest politely heard and carefully forgotten. What could a milder man have done against such handicaps and powers? No man of philosophic breadth, no scientific mind restricting belief to the evidence, no genial nature making generous allowances for the enemy, would have flung down so world-shaking a challenge, or would have marched so resolutely, as if in blinders, to his goal. If his predestinarian theology was as repugnant to reason and human kindness as any myth or miracle in the medieval faith, it was by this passionate irrationality that it moved the hearts of men, It is hope and terror that make men pray, not the evidence of things seen. It remains that with the blows of his rude fist he smashed the cake of custom, the shell of authority, that had blocked the movement of the European mind. If we judge greatness by influence—which is the least subjective test that we can use—we may rank Luther with Copernicus, Voltaire, and Darwin as the most powerful personalities in the modern world. More has been written about him than about any other modern man except Shakespeare and Napoleon. (p. 577)"