C.S. Lewis on God’s Self-ExistenceReflections on the Psalms (Harvest Books, 1964)
As we have seen, even in the creation-myths, gods have beginnings. Most of them have fathers and mothers; often we know their birthplaces. There is no question of self-existence or the timeless Being is imposed upon them, as upon us, by preceding causes. They are, like us, creatures or products; though they are luckier than we in being stronger, more beautiful, and exempt from death. They are, like us, actors in the cosmic drama, not its authors. Plato fully understood this. His God creates the gods and preserves them from death by His own power; they have no inherent immortality. In other words, the difference between believing in God and in many gods is not one of arithmetic. As someone has said “gods” is not really the plural of God; God has no plural.