Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 14. The Eucharist Is a Sacrament Properly So Called — The meaning of the name having been explained, it will be necessary to show that this is a true Sacrament, and one of those seven which the holy Church has ever revered and venerated religiously. For when the consecration of the chalice is effected, it is called a mystery of faith.