Catechism of the Catholic Church §2331 — excerpt
"God is love and in himself he lives a mystery of personal loving communion. Creating the human race in his own image . .. God inscribed in the humanity of man and woman the vocation, and thus the capacity and responsibility, of love and communion."
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.
Also cites: FC 11