Catechism of The Catholic Church #661

661 This final stage stays closely linked to the first, that is, to his descent from heaven in the Incarnation. Only the one who “came from the Father” can return to the Father: Christ Jesus. “No one has ascended into heaven but he who descended from heaven, the Son of man.” Left to its own natural powers humanity does not have access to the “Father’s house”, to God’s life and happiness. Only Christ can open to man such access that we, his members, might have confidence that we too shall go where he, our Head and our Source, has preceded us.