Catechism of the Catholic Church §156 — excerpt
What moves us to believe is not the fact that revealed truths appear as true and intelligible in the light of our natural reason: we believe "because of the authority of God himself who reveals them, who can neither deceive nor be deceived".
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.
Whole chapters cited: Mark 16
Also cites: Dei Filius: 3 DS 3008 · Dei Filius: 3 DS 3009 · Dei Filius: 3: DS 3008-3010