Man’s natural desire to know follows from his possession of an intellectual soul. The intellect was made for knowledge and seeks it. Indeed, man’s final end is knowledge.
Some philosophers have considered that the existence of God is so 'clearly seen' that it is, in fact, self-evident. If the existence of God is self-evident, there is no purpose in attempting to demonstrate it by argument. Therefore, we must begin by asking whether the existence of God is in fact self-evident.