48 "Instructed as you are in these matters," says St. Cyril of Jerusalem, at the end of a sermon on the mysteries of the faith, "and filled with an unshakeable faith that what seems to be bread is not bread—though it tastes like it—but rather the Body of Christ; and that what seems to be wine is not wine—even though it too tastes like it—but rather the Blood of Christ . . . draw strength from receiving this bread as spiritual food and your soul will rejoice." (52)
Source: Mysterium Fidei (Vatican.va)