Catechism of the Catholic Church §1715 — excerpt
He who believes in Christ has new life in the Holy Spirit. the moral life, increased and brought to maturity in grace, is to reach its fulfillment in the glory of heaven.
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.