Here is some of Augustine’s points on the Eucharist with some commentary.
St. Augustine (about 354-430 A.D.) is perhaps the greatest of the Early Church Fathers and is unfortunately often misunderstood for his discussion of sign and sacrament. The word “sacrament” for him does not mean precisely what it would in later theology, but it was a sign that contained a divine reality. The sign was visible (bread and wine) but the “reality” and the “power” of the sacrament were not. Commenting on John 6, he acknowledged that both Jews with their manna and Christians with the Eucharist had sacraments, although they were different in visible appearance or sign value. Thus, both represent Christ, but those who received the manna receive only a figure, while those who receive the Eucharist receive the Reality in truth. Hence, for Augustine sacrament is the term for “ the sign considered in itself.” But he testifies to the reality and power behind the sign telling the newly baptized:
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... I promised you who have been baptized a sermon in which I would explain the sacrament of the Lord’s table, which you now behold and which you became partakers of last night. You should understand what you have received, what you will receive, indeed what you should receive daily. The bread you see on the altar and that has been sanctified by the word of God is the Body of Christ. Through these things the Lord Christ wished to entrust to us his Body and his Blood which he shed for us unto the remission of sins. If you receive them well, you are that which you receive. The Apostle says, ‘One bread and we, the many, are one body.’ [1 Cor 10: 17]
St. Augustine also makes it clear that “. . . Christ was carried in his own hands when, entrusting us to his own Body, [for] he said: ‘This is my Body”[Mt. 26:26; Mk 14:22; Lk 22:19; 1 Cor 11:24]. Indeed he was carrying his own Body in his own hands.” St. Augustine also explains the reference in John 6 that Protestants love to bring up, namely, “It is the Spirit who gives life, the flesh profits nothing” [Jn 6: 63]. The problem with their understanding is that they were thinking of flesh as when it is cut up in a meat market or cut from a corpse and not when it is animated by the spirit. To say that the “flesh profits nothing” he says, is the equivalent of saying “knowledge puffs one up.”
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On that account are we supposed to hate knowledge? Far from it. Then what does it mean to say “knowledge puffs one up’? It does that when it is alone, without charity. And so it is added, ‘charity indeed edifies.’ Therefore add charity to knowledge and knowledge is useful, but not of itself but through charity. And so in this case where it is said, ‘Flesh profits nothing’. It refers to flesh by itself. Let spirit be added to flesh–as charity is added to knowledge–and the flesh profits very much. For, if flesh profited nothing, the Word would not have become Flesh so that he might dwell among us. If Christ has been such profit to us through the flesh, how is it that flesh profits nothing? Rather, through the Flesh the Spirit has acted for our salvation.
Thus, the Holy Spirit when joined to the flesh profits much!
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There have always been a plurality of legitimate approaches to Eucharistic theology. This was true with the Fathers and in the Middle Ages. Yet the Church has never sought to soften the shock value of Jesus’ words at the synagogue at Capernaum given to us in John 6. It was too much for most of his disciples who abandoned him as thoughts of Ezekiel 39: 17-19 came to mind, wherein it notes, “You will eat the flesh of mighty men and drink the blood of princes of the earth as if they were rams ...
source
catholicfaithandreason.org/fathersoneucharist2a.htm