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Q. 876. What happened when our Lord said, "This is my body; this is my blood"?
A. When Our Lord said, "This is my body," the substance of the bread was changed into the substance of His
body; when He said, "This is my blood," the substance of the wine was changed into the substance of His blood.








Q. 878. How do we know that it is possible to change one substance into another?
A. We know that it is possible to change one substance into another, because:
1.God changed water into blood during the plagues of Egypt.
2. Christ changed water into wine at the marriage of Cana.
3.Our own food is daily changed into the substance of our flesh and blood; and what God does gradually,
He can also do instantly by an act of His will.