Catechism of the Catholic Church §792 — excerpt
Christ "is the head of the body, the Church." He is the principle of creation and redemption. Raised to the Father's glory, "in everything he (is) preeminent," especially in the Church, through whom he extends his reign over all things.
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.