Catechism of the Catholic Church §2093 — excerpt
Faith in God's love encompasses the call and the obligation to respond with sincere love to divine charity. the first commandment enjoins us to love God above everything and all creatures for him and because of him.
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.