John 6:49
“Your fathers did eat manna in the wilderness, and are dead.”
He then establishes a thing most likely to persuade them, that they were deemed worthy of greater things than their fathers, (meaning those marvelous men who lived in the time of Moses,) and so, after saying that they were dead who ate the manna, He adds,
Ver. 51. “He that eats of this bread, shall live for ever.”
Nor has He put “in the wilderness” without a cause, but to point out that the supply of manna was not extended to a long time, nor entered with them into the land of promise. But this “bread” was not of the same kind.
“And the bread that I will give is My flesh, which I will give for the life of the world.”
Here one might reasonably enquire, how this was a fit season for these words, which neither edified nor profited, but rather did mischief to those who had been edified; for “from that time,” says the Evangelist, “many of His disciples went back,” saying, “This is a hard saying; who can hear it?”; since these things might have been entrusted to the disciples only, as Matthew has told us that He discoursed with them apart. What then shall we say? What is the profit of the words? Great is the profit and necessity of them. Because they pressed upon Him, asking for bodily food, reminding Him of the food provided in the days of their forefathers, and speaking of the manna as a great thing, to show them that all those things were but type and shadow, but that the very reality of the matter was now present with them, He mentions spiritual food. “But,” says some one, “he ought to have said, Your fathers did eat manna in the wilderness, but I have given you bread.” But the interval between the two miracles was great, and the latter of them would have appeared inferior to the former, because the manna came down from heaven, but this, the miracle of the loaves, was wrought on earth. When therefore they sought food “coming down from heaven,” He continually told them, “I came down from heaven.” And if any one enquire why He introduced the discourse on the Mysteries, we will reply, that this was a very fitting time for such discourses; for indistinctness in what is said always rouses the hearer, and renders him more attentive. They ought not then to have been offended, but rather to have asked and enquired. But now they went back. If they believed Him to be a Prophet, they ought to have believed His words, so that the offense was caused by their own folly, not by any difficulty in the words. And observe how little by little He led them up to Himself. Here He says that Himself gives, not the Father; “The bread that I will give is My flesh, which I will give for the life of the world.”
“But,” says some one, “this doctrine was strange to them and unusual.” And yet John at an earlier period alluded to it by calling Him “Lamb.” “But for all that, they knew it not.” I know they did not; nay, neither did the disciples understand. For if as yet they had no clear knowledge of the Resurrection, and so knew not what, “Destroy this Temple, and in three days I will raise it up”, might mean, much more would they be ignorant of what is said here. For these words were less clear than those. Since that prophets had raised men from the dead, they knew, even if the Scriptures have not spoken so clearly on the subject, but not one of them ever asserted that any man had eaten flesh. Still they obeyed, and followed Him, and confessed that He had the words of eternal life. For this is a disciple's part, not to be over-curious about the assertions of his teacher, but to hear and obey him, and to wait the proper time for the solution of any difficulties. “How then,” says some one, “was it that the contrary came to pass, and that these men 'went back'?” It was by reason of their folly. For when questioning concerning the “how” comes in, there comes in with it unbelief. So Nicodemus was perplexed, saying, “How can a man enter into his mother's womb?” So also these are confounded, saying,
Ver. 52. “How can this man give us his flesh to eat?”
If you seek to know the “how,” why asked not you this in the matter of the loaves, how He extended five to so great a number? Because they then only thought of being satisfied, not of seeing the miracle. “But,” says some one, “their experience then taught them.” Then by reason of that experience these words ought to have been readily received. For to this end He wrought beforehand that strange miracle, that taught by it they might no longer disbelieve what should be said by Him afterwards.
3. Those men then at that time reaped no fruit from what was said, but we have enjoyed the benefit in the very realities. Wherefore it is necessary to understand the marvel of the Mysteries, what it is, why it was given, and what is the profit of the action. We become one Body, and “members of His flesh and of His bones.” Let the initiated follow what I say. In order then that we may become this not by love only, but in very deed, let us be blended into that flesh. This is effected by the food which He has freely given us, desiring to show the love which He has for us. On this account He has mixed up Himself with us; He has kneaded up His body with ours, that we might be a certain One Thing, like a body joined to a head. For this belongs to them who love strongly; this, for instance, Job implied, speaking of his servants, by whom he was beloved so exceedingly, that they desired to cleave unto his flesh. For they said, to show the strong love which they felt, “Who would give us to be satisfied with his flesh?” Wherefore this also Christ has done, to lead us to a closer friendship, and to show His love for us; He has given to those who desire Him not only to see Him, but even to touch, and eat Him, and fix their teeth in His flesh, and to embrace Him, and satisfy all their love. Let us then return from that table like lions breathing fire, having become terrible to the devil; thinking on our Head, and on the love which He has shown for us. Parents often entrust their offspring to others to feed; “but I,” says He, “do not so, I feed you with My own flesh, desiring that you all be nobly born, and holding forth to you good hopes for the future. For He who gives out Himself to you here, much more will do so hereafter. I have willed to become your Brother, for your sake I shared in flesh and blood, and in turn I give out to you the flesh and the blood by which I became your kinsman.” This blood causes the image of our King to be fresh within us, produces beauty unspeakable, permits not the nobleness of our souls to waste away, watering it continually, and nourishing it. The blood derived from our food becomes not at once blood, but something else; while this does not so, but straightway waters our souls, and works in them some mighty power. This blood, if rightly taken, drives away devils, and keeps them afar off from us, while it calls to us Angels and the Lord of Angels. For wherever they see the Lord's blood, devils flee, and Angels run together. This blood poured forth washed clean all the world; many wise sayings did the blessed Paul utter concerning it in the Epistle to the Hebrews. This blood cleansed the secret place, and the Holy of Holies. And if the type of it had such great power in the temple of the Hebrews, and in the midst of Egypt, when smeared on the door-posts, much more the reality. This blood sanctified the golden altar; without it the high priest dared not enter into the secret place. This blood consecrated priests, this in types cleansed sins. But if it had such power in the types, if death so shuddered at the shadow, tell me how would it not have dreaded the very reality? This blood is the salvation of our souls, by this the soul is washed, by this is beautiful, by this is inflamed, this causes our understanding to be more bright than fire, and our soul more beaming than gold; this blood was poured forth, and made heaven accessible.
Source: Homilies on the Gospel of John (New Advent)