Transubstantiation (, ) is, according to the teaching of the Catholic Church, "the change of the whole substance of bread into the substance of the Body of Christ and of the whole substance of wine into the substance of the Blood of Christ". This change is brought about in the eucharistic prayer through the efficacy of the word of Christ and by the action of the Holy Spirit. However, "the outward characteristics of bread and wine, that is the 'eucharistic species', remain unaltered". In this teaching, the notions of "substance" and "transubstantiation" are not linked with any particular theory of metaphysics.
The Catholic Church teaches that, in the Eucharistic offering, bread and wine are changed into the body and blood of Christ.Wilfried Apfalter, "Science, Law, and Transubstantiation", Theology and Science 22:1 (2024) 172–183. The affirmation of this doctrine on the real presence of Christ in the Eucharist was expressed, using the word "transubstantiate", by the Fourth Council of the Lateran in 1215. It was later challenged by various 14th-century reformers, John Wycliffe in particular.
The manner in which the change occurs, the Catholic Church teaches, is a mystery: "The signs of bread and wine become, in a way surpassing understanding, the Body and Blood of Christ." In Lutheranism, the terminology used regarding the real presence is the doctrine of the sacramental union, in which the "very body and blood of Christ" is received. In the Greek Orthodox Church, the doctrine has been discussed under the term of metousiosis, coined as a direct loan-translation of transubstantiatio in the 17th century. In Eastern Orthodoxy in general, the Sacred Mystery (Sacrament) of the Eucharist is more commonly discussed using alternative terms such as "trans-elementation" (, ), "re-ordination" (, ), or simply "change" (, ).
In the Reformed tradition, a real spiritual presence is taught; this view is held in Anglicanism, especially by those of the Evangelical-Reformed tradition, though others, including those of the High Church tradition, hold to a corporeal presence.
History
Apostolic period The New Testament does not use the term transubstantiation or set out an explicit doctrine of transubstantiation. The key passages cited for teaching are Jesus's words at the Last Supper (recorded in Matthew, Mark, and Luke) where he said "This is my body" and "This is my blood," and Paul's received tradition in 1 Corinthians 11:23–26.
The Last Supper reports a meal with bread and wine on the eve of Jesus' crucifixion, in which he identifies the bread as his body and the cup as his blood, and commands repetition "in memory" of him "until he comes." By the mid-1st century Christians made sharing a loaf and cup regular practice, with Paul's tradition treating the bread and cup as participation in Jesus' body and blood.
According to church historian Volker Leppin, an "ontological interpretation" began only later but became decisive for Latin theology, with the doctrine of transubstantiation giving "philosophical expression" to the real presence under the transformed forms of bread and wine.
Patristic period The early Church Fathers used strongly realist language about the Eucharist while showing limited interest in defining the precise mode of Christ's presence, often leaving the manner of the change a mystery.Adair, J., & Svigel, M. J. (2020). Urban legends of church history: 40 common misconceptions. B&H Publishing Group. Chapter 4. "Though the early church fathers had a very high view of the Lord's Supper (or "Eucharist") and it held a central place in corporate worship from the beginning, they did not teach "transubstantiation" per se. Jaroslav Pelikan notes that Pope Alexander III "was the first to speak of 'transubstantiation,' in a work prepared about 1140." However, earlier Fathers did often closely associate the real presence of Christ with the bread and wine of the Eucharist, but not with dogmatic insistence that the invisible substance of the elements miraculously transformed into the actual body and blood of the God-man. Earlier Fathers were content simply calling the bread and wine the "body and blood" of Christ and leaving its power and profundity a mystery." (p. 26). Specifically during the period c. 100–325 AD, the doctrine of the Lord's Supper "remained indefinite and obscure", with the ancient church prioritizing "worthy participation" over logical definition and making it unhistorical to impose later theories onto this era.Schaff, P. (1882). History of the Christian Church (Vol. 2: Ante-Nicene Christianity from 100 to 325). Charles Scribner's Sons. "The doctrine concerning the sacrament of the Lord’s Supper, not coming into special discussion, remained indefinite and obscure. The ancient church made more account of the worthy participation of the ordinance than of the logical apprehension of it. She looked upon it as the holiest mystery of the Christian worship, and accordingly celebrated it with the deepest devotion, without inquiring into the mode of Christ’s presence, nor into the relation of the sensible signs to his flesh and blood. It is unhistorical to carry any of the later theories back into this age; although it has been done frequently in the apologetic and polemic discussion of this subject." (p. 151).
Gregg R. Allison characterizes early church Eucharistic theology as understanding "the Lord's Supper in a variety of ways", thereby distinguishing later Catholic doctrine from diverse patristic approaches.Allison, G. R. (2011). The Lord's Supper. In Historical theology: An introduction to Christian doctrine (Chapter 29). Zondervan. "The Catholic Church celebrates the Eucharist according to a view called transubstantiation .... The observation of the Lord's Supper by evangelicals is as varied as the above diversity presents, though they all have rejected the Catholic view of transubstantiation .... The early church understood the Lord's Supper in a variety of ways"
During the patristic period a "symbol" was commonly understood as a participating presence rather than a mere sign, so the Fathers could call the Eucharist both Christ's body and its "figure", "type", or "symbol" without contradiction. Later "realist" versus "symbolist" labels impose anachronistic categories on this Platonist sacramental worldview.Salkeld, B., & Root, M. (2019). Transubstantiation: Theology, history, and Christian unity. Baker Academic. "In the patristic age, 'symbol' did not carry the implication of less-than-fully-real that it carries today.""a symbol participates in that which it represents, so that it can almost be said to be that which it represents""the symbol is the presence of that which it represents and mediates participation in that reality""the unselfconscious oscillation between calling the Eucharist 'the body of Christ' and a 'figure,' 'type,' or 'symbol' of the body of Christ indicates that the Fathers saw no contradiction in these two types of statements""Symbol and reality were not, in the patristic period, competing doctrines of eucharistic"
Catholic readings of patristic quotes The Didache, an early Christian church order, states: "Let no one eat or drink of your Eucharist, unless they have been baptized into the name of the Lord, for ... 'Give not that which is holy to the dogs'." Kelly notes that it calls the Eucharist a "sacrifice" and describes the bread and wine as "holy" spiritual food and drink communicating immortal life. Catholic theologians cite this as early evidence that believers understood the Eucharist as more than a memorial.
Ignatius of Antioch, writing around 106, declares: "I desire the bread of God, ... the bread of life, which is the flesh of Jesus Christ ..., and I desire the drink of God, ... His blood, which is incorruptible love and eternal life." In his letter to the Smyrnaeans he warns that "heretics" "abstain from the Eucharist and from prayer, because they confess not the Eucharist to be the flesh of our Saviour Jesus Christ." Scholars treat this realism as a boundary marker that later Catholic teaching developed conceptually.
Around 150, Justin Martyr wrote: "Not as common bread and common drink do we receive these, but ... 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." Ferguson and Kelly note Justin's contrast between "common" food and the consecrated elements. Catholic authors cite scholastic transubstantiation as a later explanation of this inherited realism.
Clement of Alexandria (c. 150 – c. 215) and Tertullian (c. 200) both use "symbol" and "figure" language for the Eucharist, though scholars dispute whether this excludes real presence. Kelly and Ferguson note that Clement calls wine a "mystical symbol" of Christ's blood yet also speaks of the Eucharistic wine as a mingling of the Logos with material substance that sanctifies body and soul. In ancient symbolic realism, "figure" and "symbol" make present what they signify. Catholic theologians therefore read their symbolic language as participatory realism compatible with later transubstantiation.
Irenaeus, in Against Heresies 5.2.3, writes that "the mingled cup and the manufactured bread receives the Word of God." In the same passage, Irenaeus quotes Ephesians 5:30, including the longer textual reading: "we are members of His body, of His flesh, and of His bones." The disputed Greek phrase is "receives the Word/word of God". Priest William A. Jurgens argues that Irenaeus's Eucharistic teaching is "more indicative of an impanation mentality than of later transubstantiation," noting that Irenaeus does not explain how Christ is present in the elements.Jurgens, W. A., ed. (1970). The faith of the early fathers: Vol. 1. Liturgical Press. p. 104. By contrast, Bradley Green suggests that "in light of later Western developments, it seems appropriate to recognize a hope of transubstantiation in Irenaeus."Green, B. G., ed. (2010). Shapers of Christian orthodoxy: Engaging with early and medieval theologians. IVP Academic. p. [page number].
The Apostolic Constitutions (compiled ) instructs: "Let the bishop give the oblation, saying, The body of Christ; and let him that receiveth say, Amen." Kelly situates this formula within a fourth-century Eastern tradition that speaks of a "change" (metabolē) or "transelementation" (metastoicheiōsis) into Christ's body and blood. Catholic theologians cite this as evidence of assumed real conversion.
Ambrose of Milan taught a literal change in the elements: "This bread is bread before the words of the sacraments. When consecration has been added, from bread it becomes the body of Christ." Kelly and Papandrea describe Ambrose as a Western exponent of "conversion" language, including his insistence that the consecratory word "changes the species of the elements." Catholic scholars treat this as a patristic precursor to later transubstantiation doctrine.
Cyril of Jerusalem urges communicants to trust Christ's words that the elements have been "changed" despite their appearances, while Gregory of Nyssa and Chrysostom speak of the bread and wine being "transelemented" and "refashioned". Catholic theology cites this shared vocabulary as early conversion language later expressed by the term "transubstantiation".