CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 2786–2789

2786 "Our" Father refers to God. The adjective, as used by us, does not express possession, but an entirely new relationship with God.
2787 When we say "our" Father, we recognize first that all his promises of love announced by the prophets are fulfilled in the new and eternal covenant in his Christ: we have become "his" people and he is henceforth "our" God. This new relationship is the purely gratuitous gift of belonging to each other: we are to respond to "grace and truth" given us in Jesus Christ with love and faithfulness.
2788 Since the Lord's Prayer is that of his people in the "end-time," this "our" also expresses the certitude of our hope in God's ultimate promise: in the new Jerusalem he will say to the victor, "I will be his God and he shall be my son."
2789 When we pray to "our" Father, we personally address the Father of our Lord Jesus Christ. By doing so we do not divide the Godhead, since the Father is its "source and origin," but rather confess that the Son is eternally begotten by him and the Holy Spirit proceeds from him. We are not confusing the persons, for we confess that our communion is with the Father and his Son, Jesus Christ, in their one Holy Spirit. The Holy Trinity is consubstantial and indivisible. When we pray to the Father, we adore and glorify him together with the Son and the Holy Spirit.