Catechism of the Catholic Church §222 — excerpt
Believing in God, the only One, and loving him with all our being has enormous consequences for our whole 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.