God exists since mathematics is consistent, and the Devil exists since we cannot prove it.
Andre WeilEvery mathematician worthy of the name has experienced . . . the state of lucid exaltation in which one thought succeeds another as if miraculously . . . this feeling may last for hours at a time, even for days. Once you have experienced it, you are eager to repeat it but unable to do it at will, unless perhaps by dogged work. . . .
Andre Weil