Man is by nature and vocation a religious being. Coming from God, going toward God, man lives a fully human life only if he freely lives by his bond with God.
Man is made to live in communion with God in whom he finds happiness:
When I am completely united to you, there will be no more sorrow or trials; entirely full of you, my life will be complete.1
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.
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.2
St. Augustine, Confessions 10, 28, 39: PL 32, 795.
Cf. Vatican Council I, can. 2 § 1: DS 3026.
Vatican Council II, GS 36.