"I should say that the universe is just there, and that is all. A physicist looks for causes; that does not necessarily imply that there are causes everywhere. A man may look for gold without assuming that there is gold everywhere; if he finds gold, well and good, if he doesn't he's had bad luck. The same is true when the physicists look for causes. The fact that a belief has a good moral effect upon a man is no evidence whatsoever in favor of its truth."