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Roman Catechism
Proof From The Fathers
Whoever turns over the pages of the holy Fathers will easily perceive that on this doctrine (of transubstantiation) they have been at all times unanimous. St. Ambrose says: You say, perhaps, “this bread is no other than what is used for common food.” True, before consecration it is bread; but no sooner are the words of consecration pronounced than from bread it becomes the flesh of Christ. To prove this position more clearly, he elucidates it by a variety of comparisons and examples. In another place, when explaining these words of the Psalmist, Whatsoever the Lord pleased he hath done in heaven and on earth, St. Ambrose says: Although the species of bread and wine are visible, yet we must believe that after consecration, the body and blood of Christ are alone there. Explaining the same doctrine almost in the same words, St. Hilary says that although externally it appear bread and wine, yet in reality it is the body and blood of the Lord.