Catechism of the Catholic Church §1714 — excerpt
Man, having been wounded in his nature by original sin, is subject to error and inclined to evil in exercising his freedom.
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.