Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 136. Preparation Of Soul — The first preparation, then, which the faithful should make, is to distinguish table from table, this sacred table from profane tables, this celestial bread from common bread. This we do when we firmly believe that there is truly present the body and blood of the Lord, of Him whom the Angels adore in heaven, at whose nod the pillars of heaven fear and tremble, of whose glory the heavens and the earth are full. This is to discern the body of the Lord in accordance with the admonition of the Apostle. We should venerate the greatness of the mystery rather than too curiously investigate its truth by idle inquiry.