John Chrysostom
Why did Christ perform this Mystery at the time of Pascha? So that from everything you might know that He is the Lawgiver of the Old Testament, and that what was written in that Testament served as a foreshadowing of the New Testament events.
For this reason Christ places the reality itself alongside the figure. The evening was a sign of the fullness of times and that the works were already coming to their end.
He gives thanks to teach us how this Mystery must be celebrated. He shows that He goes willingly to His Passion. He teaches us to endure sufferings with thanksgiving and awakens good hopes in us.
If the figure was deliverance from such great slavery, then much more will the Truth deliver the whole world and give Himself for the salvation of our nature.
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This is why Christ did not establish the Mystery earlier, but when what was prescribed by the law was about to be abolished.
He abolishes the chief feast of the Jews, summoning them to another, dread supper. He says, "Take, eat; this is My Body, which is broken for many."
How were the disciples not troubled when they heard this? Because Christ had already spoken to them at length and with great solemnity about this Mystery.
Therefore He gives no further instruction about it now, since they had already heard enough. He only shows the cause of the Passion, namely, the remission of sins.
He calls it the Blood of the New Testament, that is, of the promise and proclamation of the new law. This had been promised from of old and constitutes the New Testament.
As the Old Testament had rams and calves, so the New has the Blood of the Lord. By this Christ also shows that He will suffer death. Therefore He mentions the Testament and at the same time recalls the first one.
For that Testament too had been inaugurated by blood. Then again He speaks of the cause of His death: "which is shed for many for the remission of sins." He adds, "Do this in remembrance of Me."
Do you see how Christ turns them away and draws them back from Jewish customs? As you celebrated Pascha, He says, in remembrance of the wonders that took place in Egypt, so celebrate this Mystery in remembrance of Me.
The blood of the Old Testament was poured out for the salvation of the firstborn. This Blood is poured out for the remission of the sins of the whole world.
"This is My Blood," He says, "which is shed for the remission of sins." He said this also to show that the Passion and the Cross are a Mystery, and by this again to comfort the disciples.
As Moses said, "This shall be remembered by you forever" (Ex 3:15), so Christ says, "in remembrance of Me," until the time when I come.
Therefore He also says, "With desire I have desired to eat this Pascha" (Lk 22:15). That means, to deliver to you the new ordinances and to grant the Pascha, that through it He might make you spiritual.
He Himself drank from the cup so that, when the disciples heard this, they would not say, "What is this? Are we drinking blood and eating flesh?" Thus they would not be troubled.
For when Christ had spoken of this before, many were offended even by the words themselves. Therefore, so that the disciples would not be troubled then, He Himself first performed it.
He thereby urged them to approach communion in the Mysteries without disturbance. For this purpose He Himself drank His own Blood.
What then? Should one not, you say, celebrate both the ancient and the new Mystery? By no means. Christ said, "Do this," precisely to turn us away from the ancient one.
If the new Mystery grants remission of sins, and indeed it does grant it, then the ancient one is already superfluous.
Therefore, as among the Jews, so here also Christ joined to the Mystery the remembrance of the benefit. By this He stops the mouths of the heretics.
When they say, "How is it known that Christ offered Himself in sacrifice?" we stop their mouths, besides other testimonies, by the Mysteries themselves. If Jesus did not die, of what are the Mysteries the symbol?