Catechism of the Catholic Church §177 — excerpt
"To believe" has thus a twofold reference: to the person, and to the truth: to the truth, by trust in the person who bears witness to it.
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.