Catechism of the Catholic Church §1071 — excerpt
As the work of Christ liturgy is also an action of his Church. It makes the Church present and manifests her as the visible sign of the communion in Christ between God and men.
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: SC 11