Roman Catechism 18.117

Chapter 18 — Part II: The Sacraments — The Holy Eucharist

Section 117. The Effects of the Eucharist — But with regard to the admirable virtue and fruits of this Sacrament, there is no class of the faithful to whom a knowledge of them is not most necessary. For all that has been said at such length on this Sacrament has principally for its object, to make the faithful sensible of the advantages of the Eucharist. As, however, no language can convey an adequate idea of its utility and fruits, pastors must be content to treat of one or two points, in order to show what an abundance and profusion of all goods are contained in those sacred mysteries.