Catechism of the Catholic Church §2853 — excerpt
Victory over the "prince of this world" was won once for all at the Hour when Jesus freely gave himself up to death to give us his life.
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.