Catechism of the Catholic Church §1708 — excerpt
By his Passion, Christ delivered us from Satan and from sin. He merited for us the new life in the Holy Spirit. His grace restores what sin had damaged in us.
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.