Catechism of the Catholic Church §1130 — excerpt
The Church celebrates the mystery of her Lord "until he comes," when God will be "everything to everyone." Since the apostolic age the liturgy has been drawn toward its goal by the Spirit's groaning in the Church: Marana tha!
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: St. Thomas Aquinas, STh III, 60, 3