Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 106. Many other ancient and most authoritative Fathers have written to the same effect. We faithfully confess, says St. Augustine, that before consecration it is bread and wine, the product of nature; but after consecration it is the body and blood of Christ, consecrated by the blessing. The body, says Damascene, is truly united to the Divinity, that body which was derived from the virgin; not that the body thus derived descends from heaven, but that the bread and wine are changed into the body and blood of Christ.