Gilson’s underlying concern is with revealed religion and belief in the existence of God as an act of faith. The faith that he accepts is that which has its origins in Judaism and then became Christianity and eventually Catholicism. According to Gilson, God is not provable by human reasoning but must instead be accepted because he revealed himself to Moses as He Who Is. Comprehension of God as a definable entity is beyond the understanding of the human mind. God is not an idea created by man’s intellect as an explanation of the world. God exists, is the one and only God, and is divine and totally complete in and of himself. All else is created by God and does not participate in divinity but receives grace from God. Thus, man exists because God exists and created him. Fortuitous accident or chance did not bring the world and the life contained therein into existence. The earth and everyone and everything that are part of it were purposefully created by God. The answer to all of the whys of existence—of the present human situation and of human beings’ sense of there being an existence greater than themselves—is God, as he made himself known to Moses and as he is revealed in the Bible. God is a personal God who thinks about, loves, and gives solace to humanity; he is not just nature, nor is he a mere intelligence that drives a mechanistic world governed by immutable laws. Rather, he is identifiable as He Who Is, the one and only God, the God of Abraham, the God of Isaac, the God the Jews worshiped before they knew what name to call him, the God of the Bible and of the Christian faith.