Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 1. Importance Of Instruction On The Eucharist — As of all the sacred mysteries bequeathed to us by our Lord and Saviour as most infallible instruments of divine grace, there is none comparable to the most holy Sacrament of the Eucharist; so, for no crime is there a heavier punishment to be feared from God than for the unholy or irreligious use by the faithful of that which is full of holiness, or rather which contains the very author and source of holiness. This the Apostle wisely saw, and has openly admonished us of it. For when he had declared the enormity of their guilt who discerned not the body of the Lord, he immediately subjoined: Therefore are there many infirm and weak among you, and many sleep.