Roman Catechism 15.23

Chapter 15 — Part II: The Sacraments — Introduction on the Sacraments in General

Section 23. A Sacrament Sometimes Signifies The Presence Of More Than One Thing — Besides the different significations already mentioned, a Sacrament also not infrequently indicates and marks the presence of more than one thing. This we readily perceive when we reflect that the Holy Eucharist at once signifies the presence of the real body and blood of Christ and the grace which it imparts to the worthy receiver of the sacred mysteries.