Catechism of the Catholic Church §2031 — excerpt
The moral life is spiritual worship. We "present (our) bodies as a living sacrifice, holy and acceptable to God," within the Body of Christ that we form and in communion with the offering of his Eucharist.
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.