This is My Body — Eucharistic Consecration and Transubstantiation

We see that grace can accomplish more than nature, yet so far we have been considering instances of what grace can do through a prophet’s blessing. If the blessing of a human being had power even to change nature, what do we say of God’s action in the consecration itself, in which the very words of the Lord and Savior are effective? If the words of Elijah had power even to bring down fire from heaven, will not the words of Christ have power to change the natures of the elements? You have read that in the creation of the words of Christ have power to change the natures of the elements? You have read that in the creation of the whole world he spoke and they came to be; he commanded and they were created. If Christ could by speaking create out of nothing what did not yet exist, can we say that his words are unable to change existing things into something they previously were not? It is no lesser feat to create new natures for things than to change their existing natures.

What need is there for argumentation? Let us take what happened in the case of Christ himself and construct the truth of this mystery from the mystery of the incarnation. Did the birth of the Lord Jesus from Mary come about in the course of nature? If we look at nature we regularly find that conception results from the union of man and women. It is clear then that the conception by the Virgin was above and beyond the course of nature. And this body that we make present is the body born of the Virgin. Why do you expect to find in this case that nature takes its ordinary course in regard to the body of Christ when the Lord himself was born of the Virgin in a manner above and beyond the order of nature? This is indeed the true flesh of Christ, which was crucified and buried. This is then in truth the sacrament of his flesh.

The Lord Jesus himself declares: This is my body. Before the blessing contained in these words a different thing is named; after the consecration a body is indicated. He himself speaks of his blood. Before the consecration something else is spoken of; after the consecration blood is designated. And you say: “Amen”, that is: “It is true”. What the mouth utters, let the mind within acknowledge; what the word says, let the heart ratify.

So the Church, in response to grace so great, exhorts her children, exhorts her neighbors, to hasten to these mysteries: Neighbors, she says, come and eat; brethren, drink and be filled. In another passage the Holy Spirit has made clear to you what you are to eat, what you are to drink. Taste, the prophet says, and see that the Lord is good; blessed is the man who puts his trust in him. Christ is in that sacrament, for it is the body of Christ. It is therefore not bodily food but spiritual. Thus the Apostle too says, speaking of its symbol: Our fathers ate spiritual food and drank spiritual drink. For the body of God is spiritual; the body of Christ is that of a divine spirit, for Christ is a spirit. We read: The spirit before our face is Christ the Lord. And in the letter of Saint Peter we have this: Christ died for you. Finally, it is this food that gives strength to our hearts, this drink which gives joy to the heart of man, as the prophet has written.

While the word “transubstantiation” is not employed here, the substance of this doctrine of Christ’s real presence in the Eucharist is evident in this passage from St. Ambrose’s treatise On the Mysteries (Nn. 52-54. 58: SC 25 bis, 186-188. 190) dating back to about 380 AD. Used in the Roman Office of Readings on Saturday of the 15th week in ordinary time, this excerpt explains the power of the words of Eucharistic consecration (a.k.a “the words of institution”). St. Ambrose, bishop of Milan who baptized St. Augustine, is one of the most important of the Early Church Fathers. For a general overview of the Early Church Fathers, click here.

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Ambrose of Milan, St.

St. Ambrose of Milan’s life (Sant Ambroggio de Milano in Italian) is a particularly fascinating story. St. Ambrose was born around 339 in what is now Trier, Germany, the son of the Roman prefect of Gaul. Following his father’s footsteps, Ambrose embarked upon a career in law and politics and by 370 AD, he had become the Imperial governor of Northern Italy. When the episcopal see of Milan became vacant in 374, the people demanded that Saint Ambrose be made their bishop. The neighboring bishops and the Emperor convinced him to accept this call as the will of God, and so the catechumen Ambrose was baptized and ordained first deacon, then priest, then bishop, all in a single week! This politician-turned churchman was profoundly aware of his lack of preparation for this great responsibility and so set himself immediately to prayer and the study of Scripture. His deep spirituality and love of God’s Word married together with the oratorical skill acquired in law and politics made St. Ambrose one of the greatest preachers of the early church. St. Ambrose proved to be a fierce opponent of heresy, paganism, and hypocrisy. He battled to preserve the independence of the Church from the state and courageously excommunicated the powerful Catholic Emperor Theodosius I for a massacre of innocent civilians in Thessalonica. St. Ambrose also had a significant impact on sacred music through the composition of hymns and psalm tones that are known to this day as Ambrosian chant. Besides numerous sermons and treatises on the spiritual life, Saint Ambrose is responsible for two of the first great theological works written in Latin, De Sacramentis on the Sacraments and De Spiritu Sancto on the Holy Spirit. Around 385, an ambitious professor of public speaking named Augustine came to hear Saint Ambrose preach in order to study his technique, and in the process, was attracted to the Catholic faith. In 386 Augustine was baptized by St. Ambrose and went on to become bishop of Hippo in North Africa. Ambrose and his pupil, Augustine, together with St. Jerome and St. Gregory the Great, make up the four original Doctors of the Latin Church. Saint Ambrose, the great bishop of Milan, died on Holy Saturday (April 4) in the year 397 AD. His feastday in the Roman calendar is December 7, the day he was ordained bishop. From the Roman liturgy for the Feast of St. Ambrose: “Lord, you made Saint Ambrose an outstanding teacher of the Catholic faith and gave him the courage of an apostle. Raise up iin your Church more leaders after your own heart, to guide us with courage and wisdom. We ask this through our Lord Jesus Christ, your Son, who lives and reigns with you and the Holy Spirit, one God forever and ever. Amen.”  (bio by Dr. Italy)