Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 121. The Grace Of The Eucharist Sustains — When it is said that the Eucharist imparts grace, pastors must admonish that this does not mean that the state of grace is not required for a profitable reception of this Sacrament. For as natural food can be of no use to the dead, so in like manner the sacred mysteries can evidently be of no avail to a soul which lives not by the spirit. Hence this Sacrament has been instituted under the forms of bread and wine to signify that the object of its institution is not to recall the soul to life, but to preserve its life.