*242 Q. 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.
"Substance" literally means that which stands underneath. Underneath what? Underneath the outward appearances or qualities--such as color, taste, figure, smell, etc.--that are perceptible to our senses.
Therefore we never see the substance of anything. Of this seat, for instance, I see the color, size, and shape; I feel the hardness, etc.; but I do not see the substance, namely, the wood of which it is made.
When the substance of anything is changed, the outward appearances change with it. But not so in the Holy Eucharist; for by a miracle the appearances of bread and wine remain the same after the substance has been changed as they were before. As the substance alone is changed in the Holy Eucharist, and as I cannot see the substance, I cannot see the change. I am absolutely certain, however, that the change takes place, because Our Lord said so; and I believe Him, because He could not deceive me. He is God, and God could not tell a lie, because He is infinite truth. This change is a great miracle, and that is the reason we cannot understand it, though we believe it.
Once at a marriage in Cana of Galilee (John 2) Our Lord changed water into wine. The people were poor, and Our Lord, His Blessed Mother, and the Apostles were present at the wedding when the wine ran short; and our Blessed Lady, always so kind to everyone, wishing to spare these poor people from being shamed before their friends, asked Our Lord to perform the miracle, and at her request He did so, and changed many vessels of water into the best of wine.
In that miracle Our Lord changed the substance of the water into the substance of the wine. Why, then, could He not change in the same way and by the same power the substance of bread and wine into the substance of His own body and blood? When He changed the water into wine, besides changing the substance, He changed everything else about it; so that it had no longer the appearance of water, but everyone could see that it was wine. But in changing the bread and wine into His body and blood He changes only the substance, and leaves everything else unchanged so that it still looks and tastes like bread and wine; even after the change has taken place and you could not tell by looking at it that it was changed. You know it only from your faith in the words of our divine Lord, when He tells you it is changed.
*243 Q. Is Jesus Christ whole and entire both under the form of bread and under the form of wine?
A. Jesus Christ is whole and entire both under the form of bread and under the form of wine.
*244 Q. Did anything remain of the bread and wine after their substance had been changed into the substance of the body and blood of Our Lord? A. After the substance of the bread and wine had been changed into the substance of the body and blood of Our Lord there remained only the appearances of bread and wine.
245 Q. What do you mean by the appearances of bread and wine?
A. By the appearances of bread and wine I mean the figure, the color, the taste, and whatever appears to the senses.
"Senses"--that is, eyes, ears, etc. Thus we have the sense of seeing, the sense of hearing, the sense of tasting, the sense of smelling, the sense of feeling. The Holy Eucharist is the body of Our Lord just as long as the appearances of bread and wine remain, and when they go away Our Lord's body goes also. For example, if a church, tabernacle and all, was buried by a great earthquake, and after many years the people succeeded in getting at the tabernacle and opening it, and then found in the ciborium--that is, the vessel in which the Blessed Sacrament is kept in the tabernacle--only black dust, Our Lord would not be there, although He was there when the church was buried. He would not be there, because there was no longer the appearance of bread there: it had all been changed into ashes by time, and Our Lord left it when the change took place. But if the appearance of bread had remained unchanged, He would be there even after so many years.
When we receive Holy Communion, the appearance of bread remains for about fifteen or twenty minutes after we receive, and then it changes or disappears. Therefore during these fifteen or twenty minutes that the appearance remains Our Lord Himself is really with us; and for that reason we should remain about twenty minutes after Mass on the day we receive, making a thanksgiving, speaking to Our Lord, and listening to Him speaking to our conscience. What disrespect some people show Our Lord by rushing out of the church immediately after Mass and Holy Communion, sometimes beginning to talk or look around before making any thanksgiving! When you receive Holy Communion, after returning to your seat you need not immediately begin to read your prayerbook, but may bow your head and speak to Our Lord while He is present with you. After the appearances of bread vanish, Our Lord's bodily presence goes also, but He remains with us by His grace as long as we do not fall into mortal sin.