"The concept of a single omnipotent god, reigning in the heavens in solitary grandeur... was probably devised, not by theologians, but by metaphysicians. They proved there could be but one god, not by bringing up any overt evidence to that effect, but simply by appealing to what they conceived to be the logical necessities. The human race, on its more refined and exalted levels, accepted these proofs with the head, but never with the heart."