If we go to John 5-6 we see Jesus on route to celebrate the passover in Jerusalem . As He travels He is attracting crowds that He is teaching ... He sees they are physically hungry and He feeds them with a few fish and loaves of bread .
After that miracle the crowds continued to follow Him. But they were not following Him because they were looking for a Savior, they followed Him to be fed by another miracle .
At this point Jesus rebukes them and He draws a Passover reference for them (remember that is where He was going ) He told them that Moses and the bread were a "type" pointing to Him.. The Israelites were fed manna in the desert as they followed Moses, that fed them physically.. But the He is the bread that will give men eternal life that the Father has sent .
We see that the unleavened bread of the Passover meal, that was done as a memorial of the salvation of the Jewish people in the desert , is a sign..a prophetic meal pointing to Christ.
Now move to the final passover meal..it is final because the prophesy is fulfilled shortly after it
Jesus holds up the bread...the remembrance of the manna in the desert and reveals the prophetic nature of it..He says THIS is my body ... He then tells them to now do this in memory of HIM no longer the passover. The passover is fulfilled
The Lord did not hesitate to say: “This is My Body”, when He wanted to give a sign of His body” (Augustine, Against Adimant). He [Christ] committed and delivered to His disciples the figure of His Body and Blood” (Augustine, on Psalm 3).
> [The sacraments] bear the names of the realities which they resemble. As, therefore,in a certain manner the sacrament of Christ's body is Christ's body, and the sacrament of Christ's blood is Christ's blood” (Augustine, Letter 98, From Augustine to Boniface).
Jesus himself teaches us that the Church is to observe the Supper ‘in remembrance of me’. The word remembrance is the Greek word which literally means a memorial. The Supper is no altar of sacrifice, but a table of remembrance, a place of spiritual communion with the Saviour by his Spirit. To teach that Christ has instituted a means whereby his sacrifice can be perpetuated through time is to contradict the plain teaching of Scripture.
This becomes yet clearer from the identification of the Lord’s Supper with the Passover memorial of the Old Testament. The Lord’s Supper was first celebrated at the time of the Jewish Passover and Jesus specifically identifies it as an equivalent when he says: ‘I have earnestly desired to eat this Passover with you before I suffer’ (Luke 22:15). What exactly was the Passover? It was an annual feast established by God in which the Jews would remember the night in which the angel of death ‘passed over’ those families which had applied the blood of the lamb to their door-posts (Exod. 12:1-13). ‘Now this day will be a memorial to you, and you shall celebrate it as a feast to the Lord; throughout your generations you are to celebrate it as a permanent ordinance’ (Exod. 12:14). This was a ‘memorial’ to a specific act of God in redeeming his people from bondage and death. The ‘memorial’ served to bring to remembrance an important event. It did not repeat the event but kept it vivid in the memory through a physical representation.
Just as God instituted a memorial of remembrance of redemption in the Old Testament, he has done the same in the New Testament. 1 Corinthians 5:7 states, ‘For Christ our Passover also has been sacrificed.’ His death is an accomplished fact. Now we are called, not to a sacrifice, but to a feast: ‘Let us therefore celebrate the feast . . . with the unleavened bread of sincerity and truth’ (1 Cor. 5:8). When Christ states that the bread is to be eaten and the wine drunk in remembrance of him, he is employing the same language as that of the Old Testament memorial in reference to the Passover. The Lord’s Supper is not a sacrifice, it is the commemoration of a sacrifice.
Nice try. Read in its entirety, St. Augustine’s letter does not mean what you would like and would like others to infer from the snippet you posted.