Youcat commented through CCC. Question n. 4 – Part II.

YOUCAT Question n. 4 - Part II. Can we know the existence of God by our reason?

(Youcat answer - repeated) Yes. Human reason can know God with certainty.   

A deepening through CCC

(CCC 33) The human person: with his openness to truth and beauty, his sense of moral goodness, his freedom and the voice of his conscience, with his longings for the infinite and for happiness, man questions himself about God's existence. In all this he discerns signs of his spiritual soul. The soul, the "seed of eternity we bear in ourselves, irreducible to the merely material" (GS 18 § 1; cf. 14 § 2), can have its origin only in God. (CCC 34) The world, and man, attest that they contain within themselves neither their first principle nor their final end, but rather that they participate in Being itself, which alone is without origin or end. Thus, in different ways, man can come to know that there exists a reality which is the first cause and final end of all things, a reality "that everyone calls God" (St. Thomas Aquinas, STh I, 2, 3).    

Reflecting and meditating 

(Youcat comment) The world cannot have its origin and its destination within itself. In everything that exists, there is more than we see. The order, the beauty, and the development of the world point beyond themselves toward God. Every man is receptive to what is true, good, and beautiful. He hears within himself the voice of conscience, which urges him to what is good and warns him against what is evil. Anyone who follows this path reasonably finds God.

(CCC Comment)

(CCC 46) When he listens to the message of creation and to the voice of conscience, man can arrive at certainty about the existence of God, the cause and the end of everything. (CCC 47) The Church teaches that the one true God, our Creator and Lord, can be known with certainty from his works, by the natural light of human reason (cf. Vatican Council I, can. 2 § 1: DS 3026). (CCC 35) Man's faculties make him capable of coming to a knowledge of the existence of a personal God. But for man to be able to enter into real intimacy with him, God willed both to reveal himself to man, and to give him the grace of being able to welcome this revelation in faith. The proofs of God's existence, however, can predispose one to faith and help one to see that faith is not opposed to reason.  

(This question: Can we know the existence of God by our reason? is continued)