III
What is the Eucharist?
The source and summit of the Christian life. The Body, Blood, Soul, and Divinity of Jesus Christ.
The Eucharist is not a symbol. It is not a metaphor. It is not a memorial meal in the Protestant sense. The Eucharist is the real presence of Jesus Christ — His true Body, true Blood, Soul, and Divinity — under the appearances of bread and wine. This is the central mystery of the Catholic faith, the greatest gift Christ left to His Church, and the fulfillment of His promise: "Behold, I am with you always, until the end of the age."
At the Last Supper, Jesus took bread, blessed it, broke it, and gave it to His disciples, saying, "This is my body, which will be given for you; do this in memory of me." He did not say, "This represents my body." He did not say, "This is like my body." He said, "This is my body." The same Greek verb — "estin" — is used in the Gospels when Jesus says, "I am the door," "I am the vine," "I am the good shepherd." He means what He says.
While they were eating, he took bread, said the blessing, broke it, and gave it to them, and said, "Take it; this is my body." Then he took a cup, gave thanks, and gave it to them, and they all drank from it. He said to them, "This is my blood of the covenant, which will be shed for many."
Mark 14:22-24
Analysis: The Greek word for "is" here is "estin" — the simple present tense of the verb "to be." It is not "touto estin sēmainon" (this is a sign of) or "touto estin homoiōma" (this is like). It is "touto estin to sōma mou" — "this is my body." In every other instance where Jesus uses "I am" statements in the Gospels ("I am the bread of life," "I am the light of the world," "I am the resurrection"), He is speaking literally about His own identity. He is not saying He is like bread or like light — He is declaring what He is. The same applies here. Furthermore, the phrase "blood of the covenant" directly echoes Exodus 24:8, where Moses sprinkles the blood of the covenant on the people. Jesus is instituting a new covenant, sealed not with the blood of animals but with His own blood — and He is making that blood present in the cup before Him, even before the crucifixion. This is the sacramental anticipation of the cross, the making-present of the one eternal sacrifice.
In the Gospel of John, chapter 6, Jesus makes this teaching even more explicit. He says, "I am the living bread that came down from heaven; whoever eats this bread will live forever; and the bread that I will give is my flesh for the life of the world." The Jews quarreled among themselves, saying, "How can this man give us his flesh to eat?" Jesus does not soften His teaching. He doubles down:
Amen, amen, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you do not have life within you. Whoever eats my flesh and drinks my blood has eternal life, and I will raise him on the last day. For my flesh is true food, and my blood is true drink. Whoever eats my flesh and drinks my blood remains in me and I in him.
John 6:53-56
Analysis: This is the most explicit Eucharistic teaching in the entire Bible, and it is devastating to any merely symbolic interpretation. The Greek word for "eat" in verse 53 is "phagēte" — but in verse 54, Jesus switches to "trogein," a much more graphic word meaning "to gnaw, to chew, to consume." It is the word used for animals eating. Jesus is deliberately using the most physical, literal language possible to describe eating His flesh. He does this four times in this passage. If He were speaking metaphorically, this would be the moment to clarify. Instead, He intensifies the literalism. The Jewish listeners understood Him literally — "How can this man give us his flesh to eat?" — and they were horrified. Jesus does not say, "You misunderstand; I am speaking spiritually." He lets them walk away. "As a result of this, many of his disciples returned to their former way of life and no longer accompanied him" (John 6:66). Jesus turns to the Twelve and asks, "Do you also want to leave?" Peter answers for all of us: "Master, to whom shall we go? You have the words of eternal life." The Catholic Church has never abandoned this literal understanding. The Eucharist is the true flesh and true blood of Christ.
Furthermore, the phrase "remains in me and I in him" is the language of mystical union, of real indwelling. This is not the language of a symbol. A symbol does not remain in you. You do not remain in a symbol. Only a real presence can produce this kind of mutual indwelling. St. Paul will later say, "The cup of blessing that we bless, is it not a participation in the blood of Christ? The bread that we break, is it not a participation in the body of Christ?" (1 Corinthians 10:16). The Greek word for "participation" is "koinōnia" — communion, fellowship, sharing. We do not merely remember Christ in the Eucharist; we participate in Him. We become one flesh with Him, as a bride with her bridegroom.
For anyone who eats and drinks without discerning the body, eats and drinks judgment on himself. That is why many among you are ill and infirm, and a considerable number are dying.
1 Corinthians 11:29-30
Analysis: St. Paul's warning is inexplicable if the Eucharist is merely a symbol. Why would eating ordinary bread and wine "unworthily" cause sickness and death? Paul is treating the Eucharist with the same gravity as the Old Testament treated the Ark of the Covenant — touch it unworthily, and you die (2 Samuel 6:6-7). The fact that physical consequences follow from unworthy reception proves that the Eucharist is not ordinary bread and wine. It is the real presence of Christ, and to receive it without faith, without repentance, without reverence is to commit sacrilege — to profane the body of the Lord. This is why the Catholic Church insists on the sacrament of Confession before receiving the Eucharist for those in mortal sin, and why she teaches that the Eucharist must be received with the utmost reverence and adoration.
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.
— St. Augustine of Hippo
For we do not receive these as common bread nor common drink; but since Jesus Christ our Savior was made incarnate by the word of God and had both flesh and blood for our salvation, so also we have been taught, the food which has been made into the Eucharist by the Eucharistic prayer set down by him, and by the change of which our blood and flesh is nourished, is the flesh and the blood of that incarnated Jesus.
— St. Justin Martyr, c. 155 A.D.
Take care, then, to use one Eucharist; for there is only one Flesh of our Lord Jesus Christ and one cup of union with his Blood, one altar of sacrifice, as there is one bishop with the presbyters and my fellow-servants the deacons.
— St. Ignatius of Antioch, c. 110 A.D.
Every day they devoted themselves to meeting together in the temple area and to breaking bread in their homes. They ate their meals with exultation and sincerity of heart, praising God and enjoying favor with all the people. And every day the Lord added to their number those who were being saved.
Acts 2:46-47
Analysis: The early Church "devoted themselves" to "breaking bread" — the Greek "klōntes artos" is the technical term for the Eucharist. They did this daily, not merely weekly. The Eucharist was the center of their communal life, the source of their joy, the engine of their growth. "And every day the Lord added to their number those who were being saved." The Eucharist is not a private devotion; it is the source of the Church's vitality and the sign of her unity. Where the Eucharist is celebrated, the Church is present. Where the Eucharist is absent, the Church is incomplete. This is why the Catholic Church insists on the necessity of the Eucharist for the fullness of Christian life and why she guards the Eucharist with such reverence and care.
The Eucharist is the medicine of immortality, as St. Ignatius called it. It is the antidote against death, the pledge of our resurrection, the foretaste of heaven. In receiving Holy Communion, we are united to Christ in the most intimate way possible this side of eternity. We become what we receive: the Body of Christ.