Matt. XXVI. 26-28.
“And as they were eating, Jesus took bread, and gave thanks, and broke it, and gave it to the disciples, and said, Take, eat; This is my body.”
“And He took a cup, and gave thanks, and gave it to them, saying, Drink ye all of it; This is my blood of the New Testament, Which is shed for many, for the remission of sins.”
Ah! How great is the blindness of the traitor! Even partaking of the mysteries, he remained the same; and admitted to the most holy table, he changed not. And this Luke shows by saying, that after this Satan entered into him, not as despising the Lord's body, but thenceforth laughing to scorn the traitor's shamelessness. For indeed his sin became greater from both causes, as well in that he came to the mysteries with such a disposition, as that having approached them, he did not become better, either from fear, or from the benefit, or from the honor. But Christ forbad him not, although He knew all things, that you might learn that He omits none of the things that pertain to correction. Wherefore both before this, and after this, He continually admonished him, and checked him, both by deeds, and by words; both by fear, and by kindness; both by threatening, and by honor. But none of these things withdrew him from that grievous pest.
Wherefore thenceforth He leaves him, and by the mysteries again reminds the disciples of His being slain, and in the midst of the meal His discourse is of the cross, by the continual repeating of the prediction, making His passion easy to receive. For if, when so many things had been done and foretold, they were troubled; if they had heard none of these things, what would they not have felt?
“And as they were eating, He took bread, and broke it.” Why can it have been that He ordained this sacrament then, at the time of the passover? That you might learn from everything, both that He is the lawgiver of the Old Testament, and that the things therein are foreshadowed because of these things. Therefore, I say, where the type is, there He puts the truth.
But the evening is a sure sign of the fullness of times, and that the things were now come to the very end.
And He gives thanks, to teach us how we ought to celebrate this sacrament, and to show that not unwillingly does He come to the passion, and to teach us whatever we may suffer to bear it thankfully, thence also suggesting good hopes. For if the type was a deliverance from such bondage, how much more will the truth set free the world, and will He be delivered up for the benefit of our race. Wherefore, I would add, neither did He appoint the sacrament before this, but when henceforth the rites of the law were to cease. And thus the very chief of the feasts He brings to an end, removing them to another most awful table, and He says, “Take, eat, This is my body, Which is broken for many.”
And how were they not confounded at hearing this? Because He had before told unto them many and great things touching this. Wherefore that He establishes no more, for they had heard it sufficiently, but he speaks of the cause of His passion, namely, the taking away of sins. And He calls it blood of a New Testament, that of the undertaking, the promise, the new law. For this He undertook also of old, and this comprises the Testament that is in the new law. And like as the Old Testament had sheep and bullocks, so this has the Lord's blood. Hence also He shows that He is soon to die, wherefore also He made mention of a Testament, and He reminds them also of the former Testament, for that also was dedicated with blood. And again He tells the cause of His death, “which is shed for many for the remission of sins;” and He says, “Do this in remembrance of me.” Do you see how He removes and draws them off from Jewish customs. For like as you did that, He says, in remembrance of the miracles in Egypt, so do this likewise in remembrance of me. That was shed for the preservation of the firstborn, this for the remission of the sins of the whole world. For, “This,” says He, “is my blood, which is shed for the remission of sins.”
But this He said, indicating thereby, that His passion and His cross are a mystery, by this too again comforting His disciples. And like as Moses says, “This shall be to you for an everlasting memorial,” so He too, “in remembrance of me,” until I come. Therefore also He says, “With desire I have desired to eat this passover,” that is, to deliver you the new rites, and to give a passover, by which I am to make you spiritual.
And He Himself drank of it. For lest on hearing this, they should say, What then? Do we drink blood, and eat flesh? And then be perplexed (for when He began to discourse concerning these things, even at the very sayings many were offended), therefore lest they should be troubled then likewise, He first did this Himself, leading them to the calm participation of the mysteries. Therefore He Himself drank His own blood. What then must we observe that other ancient rite also? Some one may say. By no means. For on this account He said, “Do this,” that He might withdraw them from the other. For if this works remission of sins, as it surely does work it, the other is now superfluous.
As then in the case of the Jews, so here also He has bound up the memorial of the benefit with the mystery, by this again stopping the mouths of heretics. For when they say, Whence is it manifest that Christ was sacrificed? Together with the other arguments we stop their mouths from the mysteries also. For if Jesus did not die, of what are the rites the symbols?
Source: Homilies on the Gospel of St. Matthew (New Advent)