Catechism of the Catholic Church §176 — excerpt
Faith is a personal adherence of the whole man to God who reveals himself. It involves an assent of the intellect and will to the self-revelation God has made through his deeds and words.
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.