Catechism of the Catholic Church §2134 — excerpt
The first commandment summons man to believe in God, to hope in him, and to love him above all else.
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.