The noted contributor MM to the worthy blog "Theology of the Body" has compiled an impressive collection of Eucharistic quotes by the prolific Augustine.

"Was not Christ immolated only once in His very Person? In the Sacrament, nevertheless, He is immolated for the people not only on every Easter Solemnity but on every day; and a man would not be lying if, when asked, he were to reply that Christ is being immolated." (Letters 98:9)

"That Bread which you see on the altar, having been sanctified by the word of God is the Body of Christ. That chalice, or rather, what is in that chalice, having been sanctified by the word of God, is the Blood of Christ. Through that bread and wine the Lord Christ willed to commend His Body and Blood, which He poured out for us unto the forgiveness of sins." (Sermons 227)

"How this ['And he was carried in his own hands'] should be understood literally of David, we cannot discover; but we can discover how it is meant of Christ. For Christ was carried in His own hands, when, referring to His own Body, He said, 'This is my Body.' For He carried that Body in His hands." (Ennartiones on the Psalms 33:1:10)

"Christ is both the Priest, offering Himself, and Himself the Victim. He willed that the sacramental sign of this should be the daily Sacrifice of the Church, who, since the Church is His body and He the Head, learns to offer herself through Him." (City of God 10:20)

"By those sacrifices of the Old Law, this one Sacrifice is signified, in which there is a true remission of sins; but not only is no one forbidden to take as food the Blood of this Sacrifice, rather, all who wish to possess life are exhorted to drink thereof." (Questions on the Heptateuch 3:57)

"Nor can it be denied that the souls of the dead find relief through the piety of their friends and relatives who are still alive, when the Sacrifice of the Mediator is offered for them, or when alms are given in the church." (Enchiridion on Faith, Hope, Love 29:110)

"...I turn to Christ, because it is He whom I seek here; and I discover how the earth is adored without impiety, how without impiety the footstool of His feet is adored. For He received earth from earth; because flesh is from the earth, and He took flesh from the flesh of Mary. He walked here in the same flesh, and gave us the same flesh to be eaten unto salvation. But no one eats that flesh unless first he adores it; and thus it is discovered how such a footstool of the Lord's feet is adored; and not only do we not sin by adoring, we do sin by not adoring." (Ennarationes on the Psalms 98:9)