Interpretation timeline · doctrine

The Eucharist

The doctrine of the Real Presence of Christ in the Eucharist: what is given, and how. Sources span the Apostolic Fathers to the Reformation; traditions are badged, never refereed.

From the early Church Fathers to now.

7 Patristic witnesses · 2 Catholic witnesses · 1 Lutheran witness · 2 Reformed witnesses

The Scriptures at the root
The words at issue
transubstantiatio
Latin · the West
the whole substance is changed
μετουσίωσις
Greek · the East
the same change, named in the East
"is" / "signifies"
vernacular
the verb that divided Marburg
View
Patristic before A.D. 750
Patristic A.D. 155
Justin Martyr · A.D. 100–165
“For not as common bread and common drink do we receive these; but in like manner as Jesus Christ our Saviour, having been made flesh by the Word of God, had both flesh and blood for our salvation, so likewise have we been taught that the food which is blessed by the prayer of His word, and from which our blood and flesh by transmutation are nourished, is the flesh and blood of that Jesus who was made flesh.”
The Apostolic Fathers with Justin Martyr and Irenaeus, First Apology, ch. 66 PD · ANF Vol. 1 (Roberts-Donaldson) ↗
195 years pass — nothing from this stretch is hosted yet
Patristic A.D. 350
Cyril of Jerusalem · A.D. 313–386
“Since then He Himself declared and said of the Bread, This is My Body, who shall dare to doubt any longer? And since He has Himself affirmed and said, This is My Blood, who shall ever hesitate, saying, that it is not His blood?”
Catechetical Lectures, Catechetical Lecture 22 (On the Mysteries 4), §1 PD · NPNF2 Vol. 7 (Schaff & Wace) ↗
Patristic A.D. 390
Ambrose of Milan · A.D. 339–397
“Perhaps you will say, "I see something else, how is it that you assert that I receive the Body of Christ?" And this is the point which remains for us to prove. And what evidence shall we make use of? Let us prove that this is not what nature made, but what the blessing consecrated, and the power of blessing is greater than that of nature, because by blessing nature itself is changed.”
On the Mysteries, On the Mysteries, ch. 9, §50 PD · NPNF2 Vol. 10 (Schaff & Wace) ↗
Patristic A.D. 391
John Chrysostom · A.D. 347–407
“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 hath freely given us, desiring to show the love which He hath for us. On this account He hath mixed up Himself with us; He hath kneaded up His body with ours, that we might be a certain One Thing, like a body joined to a head.”
Homilies on the Gospel of John, Homily 46 on John, §3 PD · NPNF1 Vol. 14 (Schaff) ↗
327 years pass — nothing from this stretch is hosted yet
Patristic A.D. 743
John of Damascus · A.D. 676–749
“The bread and the wine are not merely figures of the body and blood of Christ (God forbid!) but the deified body of the Lord itself: for the Lord has said, "This is My body," not, this is a figure of My body: and "My blood," not, a figure of My blood.”
An Exact Exposition of the Orthodox Faith, An Exact Exposition of the Orthodox Faith, Book IV, ch. 13 PD · NPNF2 Vol. 9 (Salmond) ↗
531 years pass — nothing from this stretch is hosted yet
Scholastic c. 1100 – 1500
Catholic 1274
Thomas Aquinas · 1225–1274
“And this is done by Divine power in this sacrament; for the whole substance of the bread is changed into the whole substance of Christ's body, and the whole substance of the wine into the whole substance of Christ's blood. Hence this is not a formal, but a substantial conversion; nor is it a kind of natural movement: but, with a name of its own, it can be called "transubstantiation."”
Summa Theologica, Summa Theologica III, q. 75, a. 4 PD · Fathers of the English Dominican Province (Shapcote) ↗
246 years pass — nothing from this stretch is hosted yet
Reformation c. 1500 – 1650
Lutheran 1520
Martin Luther · 1483–1546
“But why should not Christ be able to include His body within the substance of bread, as well as within the accidents? Fire and iron, two different substances, are so mingled in red-hot iron, that every part of it is both fire and iron. Why may not the glorious body of Christ much more be in every part of the substance of the bread?”
The Babylonish Captivity of the Church, On the Babylonish Captivity of the Church — Of the Lord's Supper PD · Wace & Buchheim, First Principles of the Reformation ↗
Event · 1529
The Marburg Colloquy

At Marburg, Luther and Zwingli agree on fourteen articles of faith; the fifteenth records that they could not agree whether the true body and blood of Christ are bodily present in the bread and wine.

Reformed 1530
Huldrych Zwingli · 1484–1531
“I believe that in the holy Eucharist, i. e., the supper of thanksgiving, the true body of Christ is present by the contemplation of faith. This means that they who thank the Lord for the benefits bestowed on us in His Son acknowledge that He assumed true flesh, in it truly suffered, truly washed away our sins by His blood; and thus everything done by Christ becomes as it were present to them by the contemplation of faith. But that the body of Christ in essence and really, i. e., the natural body itself, is either present in the supper or masticated with our mouth and teeth, as the Papists or some who look back to the fleshpots of Egypt assert, we not only deny, but constantly maintain to be an error, contrary to the Word of God.”
Fidei Ratio (An Account of the Faith), Fidei Ratio — An Account of the Faith to Charles V, art. 8 PD · W. J. Hinke, The Latin Works of Huldreich Zwingli, Vol. 2 ↗
Catholic 1551
Council of Trent · 1545–1563
“If any one saith, that, in the sacred and holy sacrament of the Eucharist, the substance of the bread and wine remains conjointly with the body and blood of our Lord Jesus Christ, and denieth that wonderful and singular conversion of the whole substance of the bread into the Body, and of the whole substance of the wine into the Blood — the species only of the bread and wine remaining — which conversion indeed the Catholic Church most aptly calls Transubstantiation; let him be anathema.”
Canons and Decrees of the Council of Trent, Session XIII, Canon II PD · J. Waterworth ↗
Reformed 1559
John Calvin · 1509–1564
“Therefore, if by the breaking of bread the Lord truly represents the partaking of his body, there ought to be no doubt whatever that he truly exhibits and performs it. The rule which the pious ought always to observe is, whenever they see the symbols instituted by the Lord, to think and feel surely persuaded that the truth of the thing signified is also present. For why does the Lord put the symbol of his body into your hands, but just to assure you that you truly partake of him? If this is true let us feel as much assured that the visible sign is given us in seal of an invisible gift as that his body itself is given to us.”
Institutes of the Christian Religion, Institutes IV, ch. 17, §10 (1559 edition) PD · Henry Beveridge ↗

The reader meets the sources first; chronology and attribution do the work. Provenance is shown on every quotation — solid for hosted public domain, dashed for link-out.