I am the living bread that came down from heaven. Whoever eats this bread will live forever. This bread is my flesh, which I will give for the life of the world.” Then the Jews began to argue sharply among themselves, “How can this man give us his flesh to eat?”Jesus said to them, “Very truly I tell you, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you. Whoever eats my flesh and drinks my blood has eternal life, and I will raise them up at the last day. For my flesh is real food and my blood is real drink. Whoever eats my flesh and drinks my blood remains in me, and I in them.

John 6: 51-56

In Christ, the Incarnate Word sent to mankind, “the whole fullness of deity, dwells bodily” (Col 2:9) through the ineffable union of his human nature and his divine nature in the Person of the Word. By receiving in this sacrament the Body and Blood of Christ indissolubly united to his divinity, we share in the divine life of the Second Person of the Blessed Trinity. We will never be able to appreciate enough the intimacy with God himself — Father, Son and Holy Spirit — that we are offered in the eucharistic banquet.

“We can therefore do nothing more agreeable to Jesus Christ than to go to Communion with the dispositions suitable to so great an action, since we are then united to Jesus Christ, according to the desire of this all-loving God. I have said with ‘suitable’ and not ‘worthy’ disposition, for who could communicate if it was necessary to be worthy of so great a Saviour? No one but a God would be worthy to receive a God. But by this word suitable, or convenient, I mean such a disposition as becomes a miserable creature, who is clothed with the unhappy flesh of Adam. Ordinarily speaking, it is sufficient that we communicate in a state of grace and with an anxious desire of advancing in the love of Jesus Christ” (St Alphonsus Liguori, The love of our Lord Jesus Christ reduced to practice, chap. 2).

Catechism

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Holy Communion augments our union with Christ. The principal fruit of receiving the Eucharist in Holy Communion is an intimate union with Christ Jesus. Indeed, the Lord said: "He who eats my flesh and drinks my blood abides in me, and I in him." Life in Christ has its foundation in the Eucharistic banquet: "As the living Father sent me, and I live because of the Father, so he who eats me will live because of me." On the feasts of the Lord, when the faithful receive the Body of the Son, they proclaim to one another the Good News that the first fruits of life have been given, as when the angel said to Mary Magdalene, "Christ is risen!" Now too are life and resurrection conferred on whoever receives Christ.

1391

[“GIVE US THIS DAY OUR DAILY BREAD”] This petition, with the responsibility it involves, also applies to another hunger from which men are perishing: "Man does not live by bread alone, but ... by every word that proceeds from the mouth of God," that is, by the Word he speaks and the Spirit he breathes forth. Christians must make every effort "to proclaim the good news to the poor." There is a famine on earth, "not a famine of bread, nor a thirst for water, but of hearing the words of the LORD." For this reason the specifically Christian sense of this fourth petition concerns the Bread of Life: The Word of God accepted in faith, the Body of Christ received in the Eucharist.