Catechism of the Catholic Church §810 — excerpt
"Hence the universal Church is seen to be 'a people brought into unity from the unity of the Father, the Son, and the Holy Spirit'" (LG 4 citing St.
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.