Catechism of the Catholic Church §2196 — excerpt
' There is no other commandment greater than these." The apostle St. Paul reminds us of this: "He who loves his neighbor has fulfilled the law.
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.