"I set out with a more or less religious belief in a Platonic eternal world, in which mathematics shone with a beauty like that of the last Cantos of the Paradiso. I came to the conclusion that the eternal world is trivial, and that mathematics is only the art of saying the same thing in different words. I set out with a belief that love, free and courageous, could conquer the world without fighting. I came to support a bitter and terrible war. In these respects there was failure."