Baltimore Catechism and the Eucharist
In the Baltimore Catechism published over 100 years ago (1885), there is an excellent section on the Eucharist.
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:
God changed water into blood during the plagues of Egypt.
Christ changed water into wine at the marriage of Cana.
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.