§2085
Morals › … › I. "You Shall Worship the Lord Your God and Him Only Shall You Serve"
The one and true God first reveals his glory to Israel. The revelation of the vocation and truth of man is linked to the revelation of God. Man's vocation is to make God manifest by acting in conformity with his creation "in the image and likeness of God":
There will never be another God, Trypho, and there has been no other since the world began . . . Than he who made and ordered the universe. We do not think that our God is different from yours. He is the same who brought your fathers out of Egypt "by his powerful hand and his outstretched arm." We do not place our hope in some other god, for there is none, but in the same God as you do: the God of Abraham, Isaac and Jacob.
Source: Catechism of the Catholic Church (Vatican.va)