Catechism of the Catholic Church §1003 — excerpt
United with Christ by Baptism, believers already truly participate in the heavenly life of the risen Christ, but this life remains "hidden with Christ in God."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.