Catechism of the Catholic Church §15 — excerpt
The second part of the Catechism explains how God's salvation, accomplished once for all through Christ Jesus and the Holy Spirit, is made present in the sacred actions of the Church's liturgy (Section One), especially in the seven sacraments (Section Two).
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.