I want this thread to be for the defense of the Eucharist and the mass/Liturgy since they are both intertwined. We are constantly attacked about the mass and the Eucharist so I feel that it would be good to defend them together. I will give my defense and I would like to see other people give there defense or modify what I say so that we can improve our defense. Here goes.
The Catholic mass is a continuation of the passover which Christ participated in at the last supper. On the passover the Jews would sacrifice the lamb in order to attone for there sins. When they had this sacrifice they would first sacrifice the lamb and then they would eat it. It was required that they eat it in order to complete the covenant with God.
The last supper was held on the passover. This is when Jesus said, “This is my body…This is my blood…” This connects Christ to the passover and the lamb.
In revelation it refers to “the lamb of God” 28 times. There is no more common term for Christ in the scriptures. When we participate in the Eucharist we are sealing the covenant with God.
Every time we say the Agnus Dei, shown below, we proclaim this.
“Lamb of God, who takes away the sins of the world, have mercy on us” “Lamb of God, who takes away the sins of the world, have mercy on us.” “Lamb of God, who takes away the sins of the world, grant us peace.”
Revelation is understood to be a liturgical book by the Church. In Revelation 1;10 it mentions that it is the Lords day that he is seeing this vision. This connects it to sunday, the day Christ rose from the dead. There are also seven candles which relate Christ to the Jewish tradition with the menora. If you go to any Byzantine Catholic Church you will see these seven candles.
In chapter 22 of Revelation it shows a view of the throne of God and of the Lamb. From the side of this throne there is a river flowing and on either side of this river there is the tree of life which shall nourish the people. There are only two other places in scripture where it has a tree and water. The first is in Genesis in the Garden of Eden. The second is the crucifixion of Christ. Christ was hung on a tree and the water flowed from his side. There is an obvious connection here between the throne of God and the crucifixion. This river nourishes the tree of life and it the tree of life nourishes the people.
In Isaiah 6, Isaiah is shown a view of Heaven. In this vision, all the angels are singing a hymm to God “Holy, Holy, Holy is the lord of hosts, the whole earth is full of his glory”. This is where the easter Catholic Churches get what the call the thrice holy hymn and where the western Catholics get the “Holy, Holy, Holy”. This connects the Church with what is being done in Heaven by the angels.(I also think verse 7 is a reference to the Eucharist but am not sure.)
When we participate in the Eucharist we are participating in the sacrifice which Christ made on the cross on Calvary Hill. We do this by sealing the covenant with God.
In John 6 Christ says that if you do not eat his flesh and blood you shall not have life in you this was shown in Revelation 22 when it says that the tree of life shall nourish the people. Because we have to eat the Eucharist in order to complete the covenant with God, the Eucharist must be the literal body and blood of Christ. Christ is the pascal supper which we participate in for the forgiveness of sins.
Yes, it is one sacrifice that Christ made, but it is a perpetual sacrifice that goes on for all time and is made available to all throughout time. It is also a rememerance of Christ, but that does not mean there is not a deeper reason for the Eucharist.
For more detail I reference John6 and 1Cor11.