Catechism of the Catholic Church §772 — excerpt
It is in the Church that Christ fulfills and reveals his own mystery as the purpose of God's plan: "to unite all things in 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.