Understanding God is not attained by calling into session all arguments for and against Him, in order to debate whether He is a reality or a figment of the mind. God cannot be sensed as a second thought, as an explanation of the origin of the universe. He is either the first and the last, or just another concept.
God in Search of Man: A Philosophy of Judaism (ed. Farrar, Straus and Giroux, 1976) - ISBN: 9781429967624