Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 76. Let St. Ambrose first declare his faith. In his book On Those Who are Initiated Into the Mysteries he says that the true body of Christ is received in this Sacrament, just as the true body of Christ was derived from the Virgin, and that this truth is to be believed with the firm certainty of faith. In another place he teaches that before consecration there is only bread, but after consecration there is the flesh of Christ.