“God …gives men an enduring witness to Himself in created realities (see Rom. 1:19-20).” (DV 3)

Just on our own, our intellect is capable of coming to some knowledge of God, such as that God is all powerful, all knowing and present everywhere. But because of sin it is a struggle to come to a proper understanding. To accept these truths of God is always an act of faith. Though there are many ways to come to knowledge of God just by using our reason alone God reveals himself to us so we can have a proper knowledge of him. Reason and faith work together to perfect our knowledge and experience of God.

Reason “Man's faculties (intellect) make him capable of coming to a knowledge of the existence of a personal God.” (CCC 35)

Faith: “… faith is not opposed to reason.” (CCC 35)