In the Bread of Life Discourse at Capernaum, Jesus solemnly affirms ("Amen, amen, I say to you") the sacramental necessity of the Eucharist: unless we eat the flesh of the Son of Man and drink His blood, we do not have divine life within us.
After multiplying the loaves and fishes (John 6:1–15), Jesus directs the crowd from perishable manna in the desert to the true Bread from heaven—His own sacrificial Body and Blood given for the life of the world (John 6:51–58; CCC 1384).
Approach the Holy Eucharist with deep reverence, purity of heart, and thanksgiving, recognizing that in Holy Communion we receive Christ Himself, the source and summit of the Christian life.
“Lord Jesus, Living Bread come down from heaven, nourish my soul with Your Body and Blood so that I may abide in You and rise to eternal glory on the last day. Amen.”
“Litigabant ergo Judæi ad invicem, dicentes : Quomodo potest hic nobis carnem suam dare ad manducandum ?”
“Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.”
“So Jesus said to them, “Truly, truly, I tell you, unless you eat the flesh and drink the blood of the Son of Man, you have no life in you.”
“Jesus therefore said to them, “Most certainly I tell you, unless you eat the flesh of the Son of Man and drink his blood, you don’t have life in yourselves.”
“Jesus therefore said unto them, Verily, verily, I say unto you, Except 1437, 3361 ye eat the flesh of the Son of man and drink his blood, ye have not life in yourselves.”
They will still understand spiritual things in a carnal sense; yet it is hard to conceive how they could imagine that Christ spake of giving them his flesh to eat, as men eat the flesh of oxen or sheep; but which way soever they did understand it indeed, their captious temper inclined them to conceal any other sense they had of it, and to represent what our Saviour said as exceedingly absurd.
Because the Jews said it was impossible to give them his flesh to eat, Christ answers them by telling them, that so far from being impossible, it is very necessary that they should eat it. “Unless you eat,” &c. (St. Chrysostom) — It is not the flesh of merely a man, but it is the flesh of a God, able to make man divine, inebriating him, as it were, with the divinity. (Theophylactus) See Maldonatus.
[1.] The necessity of our feeding upon Christ (v. 53): Except you eat the flesh of the Son of man, and drink his blood, you have no life in you. That is, First, "It is a certain sign that you have no spiritual life in you if you have no desire towards Christ, nor delight in him." If the soul does not hunger and thirst, certainly it does not live: it is a sign that we are dead indeed if we are dead to such meat and drink as this. When artificial bees, that by curious springs were made to move to and fro, were to be distinguished from natural ones (they say), it was done by putting honey among them, which the natural bees only flocked to, but the artificial ones minded not, for they had no life in them. Secondly, "It is certain that you can have no spiritual life, unless you derive it from Christ by faith; separated from him you can do nothing." Faith in Christ is the primum vivens—the first living principle of grace; without it we have not the truth of spiritual life, nor any title to eternal life: our bodies may as well live without meat as our souls without Christ.
4. Christ, having thus spoken of himself as the bread of life, and of faith as the work of God, comes more particularly to show what of himself is this bread, namely, his flesh, and that to believe is to eat of that, v. 51-58, where he still prosecutes the metaphor of food. Observe, here, the preparation of this food: The bread that I will give is my flesh (v. 51), the flesh of the Son of man and his blood, v. 53. His flesh is meat indeed, and his blood is drink indeed, v. 55. Observe, also, the participation of this food: We must eat the flesh of the Son of man and drink his blood (v. 53); and again (v. 54), Whoso eateth my flesh and drinketh my blood; and the same words (v. 56, 57), he that eateth me. This is certainly a parable or figurative discourse, wherein the actings of the soul upon things spiritual and divine are represented by bodily actions about things sensible, which made the truths of Christ more intelligible to some, and less so to others, Mark 4 11-12. Now,
Verses 52-59 The flesh and blood of the Son of man, denote the Redeemer in the nature of man; Christ and him crucified, and the redemption wrought out by him, with all the precious benefits of redemption; pardon of sin, acceptance with God, the way to the throne of grace, the promises of the covenant, and eternal life. These are called the flesh and blood of Christ, because they are purchased by the breaking his body, and the shedding of his blood. Also, because they are meat and drink to our souls. Eating this flesh and drinking this blood mean believing in Christ. We partake of Christ and his benefits by faith. The soul that rightly knows its state and wants, finds whatever can calm the conscience, and promote true holiness, in the redeemer, God manifest in the flesh. Meditating upon the cross of Christ gives life to our repentance, love, and gratitude. We live by him, as our bodies live by our food. We live by him, as the members by the head, the branches by the root: because he lives we shall live also.