The Chalcedonian Definition

Ecumenical Creeds Reference

The Creed
Background and Historical Setting
What It Guards Against
A Walk Through the Creed
Key Doctrinal Points
Scriptural Foundation
A Reformed Reading: Clarifications and Disputed Points
How the Reformed Standards Receive It
Christ and the Gospel in the Creed
Questions for Reflection and Application
For Confession and Memory
Further Reading

The Creed

We, then, following the holy Fathers, all with one consent, teach men to confess one and the same Son, our Lord Jesus Christ, the same perfect in Godhead and also perfect in manhood; truly God and truly man, of a reasonable soul and body; consubstantial with the Father according to the Godhead, and consubstantial with us according to the manhood; in all things like unto us, without sin; begotten before all ages of the Father according to the Godhead, and in these latter days, for us and for our salvation, born of the Virgin Mary, the Mother of God, according to the manhood; one and the same Christ, Son, Lord, Only-begotten, to be acknowledged in two natures, inconfusedly, unchangeably, indivisibly, inseparably; the distinction of natures being by no means taken away by the union, but rather the property of each nature being preserved, and concurring in one Person and one Subsistence, not parted or divided into two persons, but one and the same Son, and only-begotten, God the Word, the Lord Jesus Christ; as the prophets from the beginning have declared concerning him, and the Lord Jesus Christ himself has taught us, and the Creed of the holy Fathers has handed down to us.

Background and Historical Setting

The Chalcedonian Definition is, strictly, not a “creed” but a definition or symbol — a conciliar statement of the boundaries of orthodoxy. It is grouped with the catholic creeds because it settled, for the great central tradition of the church, the question the creeds left open: given that Jesus Christ is truly God and truly man, how do the two go together in one person?

Nicaea (325) and Constantinople (381) had secured the Son’s full deity; the question that remained was Christological. Through the fourth and fifth centuries two great schools pressed competing instincts. The Antiochene school guarded the distinction of the natures, lest the divine swallow up the human. The Alexandrian school guarded the unity of the person, lest Christ be split into two sons. Each had a truth; each, pressed too far, bred a heresy.

The crisis came in two waves. First, Nestorius, patriarch of Constantinople, was understood to so divide the natures that he seemed to teach two persons loosely joined, and he objected to calling Mary Theotokos (“God-bearer,” Mother of God). The Council of Ephesus (431), led by Cyril of Alexandria, condemned this and affirmed Theotokos — not to exalt Mary but to confess that the one born of her is truly God. Then the pendulum swung: Eutyches, an aged archimandrite of Constantinople, taught that after the union Christ had but one nature, the human absorbed into the divine “like a drop of honey in the sea.” This is monophysitism (one-nature-ism) or Eutychianism. A disorderly synod at Ephesus in 449 — which Pope Leo branded the “Robber Council” (Latrocinium) — backed Eutyches.

To resolve it, the Emperor Marcian summoned the Council of Chalcedon in 451, the largest of the ancient councils, with some five to six hundred bishops. Drawing on Cyril’s letters and on the Tome of Leo (Pope Leo I’s masterly statement of the two natures), the council produced the Definition: one person, two natures, “without confusion, change, division, or separation.” It is the charter of orthodox Christology.

What It Guards Against

The Definition is famous for four adverbs that fence off four errors, two on each side:

Nestorianism — dividing the one Christ into two persons or two sons, the human and the divine merely conjoined. Guarded by “indivisibly, inseparably” and by the insistence on “one and the same Son… not parted or divided into two persons.” Confessing Mary as Theotokos makes the same point: the one she bore is a single person who is God.
Eutychianism / Monophysitism — fusing the two natures into one, the human absorbed into the divine, so that Christ is neither fully God nor fully man. Guarded by “inconfusedly, unchangeably” and by “the property of each nature being preserved.”
Apollinarianism — that in Christ the divine Logos replaced the human mind or rational soul, leaving an incomplete humanity. Guarded by “perfect in manhood… of a reasonable soul and body” and “consubstantial with us according to the manhood.” (As the Fathers said, “what is not assumed is not healed.”)
Arianism / any denial of true deity — answered again by “truly God… consubstantial with the Father according to the Godhead.”

Two natures, then, fully preserved; one person, undivided. The four adverbs hold the line on both sides at once.

A Walk Through the Creed

“one and the same Son, our Lord Jesus Christ.” The refrain of the whole Definition: whatever is said of Godhead and manhood is said of one subject. There is no second Christ.

“the same perfect in Godhead and also perfect in manhood; truly God and truly man.” Both natures are complete. Not God in a man-suit, nor a man specially graced, but truly God and truly man (John 1:14; 1 Tim. 2:5).

“of a reasonable soul and body.” His humanity is whole — a human mind and will and body, not deity wearing flesh (Heb. 2:17; against Apollinaris). He grew, hungered, wept, prayed (Luke 2:52; John 11:35).

“consubstantial with the Father according to the Godhead, and consubstantial with us according to the manhood.” Homoousios twice over: of one substance with the Father as to deity, of one substance with us as to humanity (Heb. 1:3; Heb. 2:14). He stands fully on both sides of the gulf he came to bridge.

“in all things like unto us, without sin.” Truly one of us, yet sinless (Heb. 4:15; 2 Cor. 5:21). His likeness to us is real; his sinlessness is what qualifies him to save.

“begotten before all ages of the Father according to the Godhead, and in these latter days… born of the Virgin Mary, the Mother of God, according to the manhood.” Two “births”: eternally begotten as God, born in time as man (John 1:1, 14; Gal. 4:4). Theotokos (“Mother of God”) safeguards the unity — she bore not a nature but a person, and that person is God.

“one and the same Christ… to be acknowledged in two natures, inconfusedly, unchangeably, indivisibly, inseparably.” The heart of it. Two natures, recognized in one Christ, related by four negations:

inconfusedly — not blended into a third thing;
unchangeably — the divine does not become human nor the human divine;
indivisibly — never separated into two acting subjects;
inseparably — never to be pulled apart, now or ever.

“the distinction of natures being by no means taken away by the union, but rather the property of each nature being preserved.” The union does not erase the difference; each nature keeps what is proper to it. Deity remains omnipotent and impassible; humanity remains finite and able to suffer (Phil. 2:6–8).

“concurring in one Person and one Subsistence (hypostasis), not parted or divided into two persons.” The two natures meet in one person — the eternal Son, “God the Word, the Lord Jesus Christ.” There is one “who,” acting in and through both natures.

Key Doctrinal Points

Jesus Christ is one person (hypostasis) in two natures, divine and human.
Each nature is complete: truly God (consubstantial with the Father) and truly man (consubstantial with us, body and rational soul), yet without sin.
The two natures are united “without confusion, change, division, or separation” — neither blended nor split.
Each nature retains its own properties within the one person (the basis of the communicatio idiomatum — what is true of either nature is said of the one Christ).
Mary is rightly called Theotokos — not to exalt her, but to confess that the one born of her is God the Son.

Scriptural Foundation

John 1:1, 14 — “the Word was God… and the Word became flesh” — one person, eternally God, who became truly man.
Phil. 2:6–8 — “though he was in the form of God… emptied himself, by taking the form of a servant” — full deity and true humanity in one subject.
Heb. 2:14–17 — “he himself likewise partook of the same things… made like his brothers in every respect” — true and complete humanity, that he might save.
Heb. 4:15 — “in every respect has been tempted as we are, yet without sin.”
Col. 2:9 — “in him the whole fullness of deity dwells bodily.”
1 Tim. 2:5 — “one mediator between God and men, the man Christ Jesus” — the God-man as the one bridge.
Luke 1:35; Gal. 4:4 — born of the Virgin, “born of woman, born under the law.”

A Reformed Reading: Clarifications and Disputed Points

“A definition, not a creed.” A Reformed reader should know that Chalcedon is technically a conciliar definition or symbol, not a creed recited in worship. It is grouped with the catholic creeds because it functions as one — a binding statement of orthodox faith. The Reformed receive it without reservation as the true and necessary safeguard of the gospel’s center: that our Mediator is one person, truly God and truly man.

The two natures “without confusion, change, division, or separation.” This is not a disputed point for the Reformed but a cherished one, and it does real work in Reformed theology. Because each nature keeps its own properties, the Reformed have insisted that in the incarnation the Son did not surrender or contract his deity — the eternal Word continued to uphold the universe even while in the womb and on the cross. This conviction, the so-called extra Calvinisticum (the “Calvinist extra“), is simply Chalcedon taken seriously: the divine nature is not confined to or absorbed by the human. It also undergirds the Reformed reading of the Lord’s Supper: because Christ’s humanity remains true humanity — local, bodily, now ascended — his body is in heaven, and we feed on him by the Spirit through faith, not by a physical presence in the elements that would require his human nature to take on a divine ubiquity (a point of real difference with the Lutheran view). Chalcedon’s “without confusion” thus shapes Reformed worship at the Table.

Oriental Orthodox non-reception. Chalcedon was not received by all. The churches now called Oriental Orthodox — the Coptic, Armenian, Ethiopian, Syriac, and Malankara churches — rejected the Definition and have stood apart from the Chalcedonian world ever since, the first great enduring division of the church (predating 1054). They are often labeled “monophysite,” but most prefer miaphysite: following Cyril of Alexandria’s formula “one incarnate nature of God the Word,” they confess one united nature in which Godhead and manhood are fully present, unmixed and unconfused — not the Eutychian idea of the human absorbed into the divine. Modern dialogue (notably the joint statements from the 1960s–1990s) has led many on both sides to conclude that the division was substantially verbal — a clash over the word physis (nature) — and that Oriental and Chalcedonian Christology may confess the same faith in different vocabularies. A charitable Reformed reader states this honestly: the Oriental churches are not Eutychian heretics but estranged kin, and we should represent their miaphysite confession fairly even as we hold the Chalcedonian “two natures” to be the clearer and safer language.

Mary as Theotokos (“Mother of God”). The Reformed affirm the title in the precise sense Chalcedon intends: it is a statement about Christ, not a Marian honorific. To deny that Mary bore God the Son is to divide the one Christ (the Nestorian error). The Reformed gladly confess Theotokos in this Christological sense while rejecting the later Marian devotions, dogmas, and intercessions that the title came to carry in medieval and Roman piety. We honor Mary as “blessed among women” (Luke 1:42) and confess her Son as our God.

How the Reformed Standards Receive It

Chalcedonian Christology is woven into the Reformed confessions almost word for word. The Westminster Confession (VIII.2) states it precisely: “The Son of God… did, when the fullness of time was come, take upon him man’s nature, with all the essential properties and common infirmities thereof, yet without sin… so that two whole, perfect, and distinct natures, the Godhead and the manhood, were inseparably joined together in one person, without conversion, composition, or confusion. Which person is very God and very man, yet one Christ, the only Mediator between God and man.” That sentence is Chalcedon in Reformed dress. The Belgic Confession (Art. 18–19) confesses the same two natures “united and joined together in one person; yet each nature retains its own distinct properties” — and explicitly defends the extra Calvinisticum, that the divine nature “remained in him” while he lay in the grave. The Heidelberg Catechism (Q&A 35, 47–48) teaches the two natures and their relation for the comfort of believers. The Reformed thus stand wholly within Chalcedonian orthodoxy.

Christ and the Gospel in the Creed

Chalcedon can look like dry metaphysics, but it is the architecture of the gospel. Our salvation hangs on the two natures held together in one person. If Christ were not truly God, his death could not bear infinite guilt nor his righteousness avail for many — a creature cannot save. If he were not truly man, he could not stand in our place, obey in our nature, suffer our death, or be the “one mediator… the man Christ Jesus” (1 Tim. 2:5). And if the two were not joined in one person, there would be no single Savior whose obedience and death are reckoned to us. The Definition is the church’s way of guarding the wonder of Bethlehem and Calvary: the infinite God assumed our finite flesh, “for us and for our salvation,” that in one person God and man might be reconciled forever. To confess Chalcedon is to confess the only Mediator who is able to save.

Questions for Reflection and Application

Q: Why must my Savior be both truly God and truly man?

Biblical answer: As true man he can stand in our place and die for us; as true God his sacrifice has infinite worth and power to save — “there is one God, and there is one mediator between God and men, the man Christ Jesus, who gave himself as a ransom” (1 Tim. 2:5–6; cf. Heb. 2:14–17). Why it matters: A Christ who is less than God could not bear our sin, and one who is less than man could not represent us; my whole salvation depends on the union Chalcedon confesses.

Q: What does it mean that the two natures are united “without confusion” or “change”?

Biblical answer: Each nature keeps its own properties; the divine did not shrink into the human nor the human dissolve into the divine — “in him the whole fullness of deity dwells bodily” (Col. 2:9), even as he grew, hungered, and wept (Luke 2:52; John 11:35). Why it matters: It assures me that the Son lost nothing of his deity in becoming man, and that he remains truly one of us — fully able to sympathize and fully able to save (Heb. 4:15).

Q: Should I call Mary the “Mother of God,” and what does it mean?

Biblical answer: Yes, in the sense Chalcedon intends — the child she bore is one person who is God the Son (Luke 1:35, 43, where Elizabeth calls her “the mother of my Lord”); it confesses Christ, not Mary. Why it matters: Denying it would split the one Christ into two; affirming it rightly guards the unity of his person, while we reserve worship and prayer for God alone.

Q: How should I regard the Oriental Orthodox churches that did not receive Chalcedon?

Biblical answer: As fellow confessors of the one Christ to be examined charitably and by Scripture (1 Cor. 13:7; Eph. 4:3); their miaphysite confession affirms full deity and full humanity unmixed, not the Eutychian heresy. Why it matters: It teaches me to state others’ views fairly before judging them, and to grieve the church’s divisions while holding firmly to the clearest biblical language.

For Confession and Memory

Though longer and more technical than the other creeds, the Chalcedonian Definition repays slow reading and is worth knowing well — especially the four great adverbs, “without confusion, without change, without division, without separation,” which can be carried in the memory as a guardrail against every Christological error. It is not commonly recited in worship, but it stands behind every hymn and prayer addressed to the God-man. Confess it as the church’s settled answer to the question, “Who is this Jesus?” — and let it deepen your wonder at the one person who is truly God and truly man for you.