Explore the Definition of Chalcedon: Jesus Christ, Fully God and Fully Man
The Definition of Chalcedon is one of Christianity’s most important historical statements about Jesus Christ. Adopted at the Council of Chalcedon in AD 451, it affirms that Jesus is fully God and fully man, united in one person. Its teaching became foundational to historic Christian understanding of the Incarnation. The definition arose from disputes concerning Christ’s divine and human natures. Christian leaders sought to explain how the eternal Son of God truly became human without surrendering his divinity. Their statement protected the biblical confession of one Lord Jesus Christ while rejecting teachings that divided his person or confused his two natures.
This Definition of Chalcedon commentary presents its central historical confession and explains its teachings through Scripture. It also examines the council’s background, important theological terms, Christian reception, and the significance of Christ’s divine and human natures for salvation.
Quick Facts About the Definition of Chalcedon
| Category | Information |
|---|---|
| Name | Definition of Chalcedon |
| Other names | Chalcedonian Definition; Chalcedonian Creed |
| Date | October 22–25, AD 451 |
| Council | Fourth Ecumenical Council, in Chalcedonian Christianity |
| Location | Chalcedon, near Constantinople |
| Original language | Greek |
| Authors | Bishops assembled at the Council of Chalcedon |
| Main purpose | Clarify the person and two natures of Jesus Christ |
| Central teaching | One person, fully divine and fully human |
| Famous expression | Without confusion, change, division, or separation |
| Important influences | Nicene Creed, Cyril of Alexandria, and Leo’s Tome |
| Historical reception | Roman Catholic, Eastern Orthodox, and many Protestant traditions; rejected by Oriental Orthodox churches |
The Text of the Definition of Chalcedon
The following is the complete central Christological confession from the council’s Definition of Faith, in the historical English translation published by Philip Schaff in Creeds of Christendom, Volume II.
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 [rational] soul and body; consubstantial [coessential] 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.
Text source: Philip Schaff, Creeds of Christendom, Volume II: The Symbol of Chalcedon. The historical English translation is in the public domain in the United States. The complete conciliar Definition of Faith, including its introductory declaration and concluding ruling, is also freely available.
The expression perfect in Godhead and perfect in manhood means complete in both divine and human nature. The definition’s central teaching is that Jesus Christ is one person who possesses two complete and distinct natures.
Historical Background: Why Was the Definition of Chalcedon Written?
The Nicene Creed and Christ’s Divine Identity
The Council of Nicaea in AD 325 defended the full divinity of Jesus Christ. It affirmed that the Son is eternally begotten of the Father and shares the same divine nature. The Council of Constantinople in AD 381 further clarified the Church’s Trinitarian confession.
These councils established essential teaching about Christ’s eternal identity. However, questions remained concerning the relationship between his divinity and humanity.
Christians confessed that the eternal Son became flesh, as John 1:14 teaches. Yet theologians needed to explain how the divine Son could possess complete humanity while remaining truly God.
The resulting debates concerned the doctrine of the Incarnation. They also raised important questions about Christ’s suffering, human experience, and saving work.
Apollinaris and the Completeness of Christ’s Humanity
During the fourth century, Apollinaris of Laodicea proposed an explanation that compromised Christ’s complete humanity. His teaching assigned the divine Word a role that displaced the rational human mind or soul in Christ.
This approach attempted to preserve the unity of Christ’s person. However, it denied that the eternal Son had assumed the full human nature shared by other people.
Christian opponents argued that Christ must possess a genuine human mind and soul, as well as a body. Hebrews 2:14-18 describes the Son sharing human nature to accomplish redemption.
This controversy helps explain why Chalcedon specifically identifies Christ as possessing a rational soul and body. The definition affirms complete humanity, not merely the appearance of human life.
Nestorius, Cyril of Alexandria, and the Council of Ephesus
Further controversy arose during the fifth century concerning the unity of Christ’s person.
Nestorius became bishop of Constantinople in AD 428. Debates soon developed around the title Theotokos, commonly translated “God-bearer” or “Mother of God,” when applied to Mary.
Nestorius expressed concern about language that might confuse Christ’s deity and humanity. His opponents, particularly Cyril of Alexandria, believed his teaching separated the divine Son from the man Jesus too sharply.
Cyril emphasized that the one born from Mary was the eternal Son of God incarnate. Christ’s divine and human characteristics belong to one person, not two separate subjects.
The Council of Ephesus in AD 431 condemned Nestorius and affirmed Cyril’s central Christological teaching. Nevertheless, disagreements continued over the language used to describe Christ’s two natures.
In AD 433, Cyril and John of Antioch reached a reconciliation through a confession commonly called the Formula of Reunion. Their agreement affirmed Christ’s complete divinity and humanity while confessing one Lord Jesus Christ.
Eutyches, Leo’s Tome, and the Disputes of AD 449
A different difficulty arose from attempts to defend Christ’s unity.
Eutyches, an influential monk near Constantinople, became associated with teaching that failed to preserve the full distinction between Christ’s divine and human natures after the Incarnation. His position was widely understood as compromising Christ’s genuine humanity.
Flavian, bishop of Constantinople, opposed Eutyches and supported a confession of Christ’s complete divinity and humanity. In AD 449, Leo I, bishop of Rome, wrote a doctrinal letter to Flavian known as Leo’s Tome.
Leo emphasized that Christ’s two natures remain distinct while belonging to one person. His explanation defended the reality of Christ’s suffering without claiming that the divine nature itself could suffer or change.
Another council met at Ephesus in AD 449 under the leadership of Dioscorus of Alexandria. Its controversial proceedings restored Eutyches and condemned Flavian. The decisions intensified the divisions among Christian leaders.
The Council of Chalcedon in AD 451
Emperor Marcian and Empress Pulcheria supported the calling of a new council in AD 451. Bishops gathered at Chalcedon, near Constantinople, to address the continuing controversies.
The council reaffirmed the Nicene faith and received important Christological writings associated with Cyril of Alexandria and Leo I. It also reviewed earlier proceedings and deposed Dioscorus.
On October 22, AD 451, the council adopted its doctrinal definition. The statement was solemnly read and confirmed in the emperor’s presence on October 25. It affirmed one and the same Jesus Christ in two natures, without confusion, change, division, or separation.
The definition sought to preserve the complete divinity and humanity of Christ within the unity of his person. However, not all Christian communities accepted its language or the council’s decisions. These disagreements produced divisions that continued long after AD 451.
Historical Timeline: Development of Chalcedonian Christology
- AD 325: Council of Nicaea. Bishops affirm the eternal divinity of the Son and his shared divine nature with the Father.
- AD 381: Council of Constantinople. The Church further clarifies Trinitarian teaching, including the full divinity of the Holy Spirit.
- AD 431: Council of Ephesus. The council condemns Nestorius and affirms the unity of Christ’s person.
- AD 433: Formula of Reunion. Cyril of Alexandria and John of Antioch reach an agreement concerning Christ’s divinity, humanity, and personal unity.
- AD 449: Further Christological controversy. Leo writes his Tome to Flavian, while the disputed council at Ephesus intensifies divisions.
- AD 451: Council of Chalcedon. Bishops adopt and confirm the Definition of Faith, confessing one Christ in two complete natures.
Outline: The Main Teachings of the Definition of Chalcedon
| Division | Central teaching |
|---|---|
| One and the same Son | Jesus Christ is one person, the eternal Son of God |
| Perfect in Godhead | Christ possesses complete divinity |
| Perfect in manhood | Christ possesses complete humanity |
| Rational soul and body | Christ has a genuine human mind, soul, and body |
| Consubstantial with the Father | Christ shares the Father’s divine nature |
| Consubstantial with humanity | Christ shares our human nature, apart from sin |
| Eternal Son and human birth | The same Son is eternally begotten and born of Mary |
| Two natures | Divinity and humanity remain distinct within one Christ |
| Four safeguards | Without confusion, change, division, or separation |
| One person and subsistence | Christ is never divided into two persons |
| Biblical and historic continuity | The definition claims consistency with Scripture and earlier Christian confession |
The definition’s language is carefully balanced. It protects Christ’s real humanity and complete deity while insisting that both belong to the same eternal Son.
Definition of Chalcedon Explained: Line-by-Line Commentary
Article 1: “One and the Same Son, Our Lord Jesus Christ”
The definition begins by identifying Jesus Christ as one and the same Son. This statement establishes the personal unity that governs everything that follows. The eternal Son of God and Jesus Christ born of Mary are one person, not two individuals joined by a special relationship.
John 1:1-14 identifies the eternal Word as God and declares that the Word became flesh. The person who entered human history is therefore the same divine Word who existed with the Father before creation. Galatians 4:4 likewise identifies the one born of a woman as God’s Son.
The expression one and the same also protects the unity of Christ’s saving work. The one who taught, suffered, died, and rose again is the eternal Son acting through his genuine human nature. Every event of his earthly life belongs to the same person.
Scripture Connections: John 1:1-14; John 3:16-17; Galatians 4:4-5; Philippians 2:5-8; Hebrews 1:1-3.
Article 2: “Perfect in Godhead and Also Perfect in Manhood”
This statement confesses that Jesus Christ possesses complete divinity and complete humanity. The word perfect means complete or lacking nothing essential to either nature. Christ is not partly divine and partly human. He is fully God and fully man.
Colossians 2:9 teaches that the fullness of deity dwells in Christ bodily. John 1:14 likewise declares that the eternal Word became flesh. These passages establish the two truths that Chalcedon carefully preserves: Christ’s divine identity and his genuine entrance into human life.
The Incarnation did not diminish the Son’s deity or produce an incomplete humanity. He remained everything he eternally was as God while assuming everything essential to human nature, apart from sin. His divine and human natures are complete, yet they belong to one person.
Scripture Connections: John 1:1-14; Romans 1:3-4; Philippians 2:5-8; Colossians 2:9; Hebrews 2:14-18.
Article 3: “Truly God and Truly Man, of a Reasonable Soul and Body”
The definition further explains Christ’s full humanity by naming his rational soul and body. The expression reasonable soul refers to a genuine rational human soul, including the human capacity for thought and understanding. Jesus did not merely possess a human body controlled by a divine mind in place of a human mind.
The Gospels reveal Christ experiencing ordinary human life. He grew in wisdom, became hungry and tired, felt sorrow, and faced temptation without sin. Luke 2:52 describes his human development, while John 4:6 and Matthew 4:2 record his weariness and hunger. His sorrow before the crucifixion further demonstrates his genuine human experience.
Hebrews 2:17 teaches that Christ became like his brothers in all things to serve as a merciful and faithful High Priest. His complete humanity matters because he truly represents those he came to redeem. He possesses the human nature that needed salvation, while remaining the holy and sinless Son of God.
Scripture Connections: Matthew 4:2; Matthew 26:38; Luke 2:52; John 4:6; Hebrews 2:14-18; Hebrews 4:15.
Article 4: “Consubstantial with the Father According to the Godhead”
The term consubstantial means sharing the same essence or nature. When Chalcedon applies this word to Christ’s divinity, it affirms the teaching established at Nicaea. The Son eternally possesses the same undivided divine nature as the Father.
John 1:1 identifies the Word as God, while Hebrews 1:3 describes the Son as the radiance of God’s glory and the exact representation of his being. John 17:5 also speaks of the glory Christ shared with the Father before the world existed.
The Son’s divine nature did not begin at his conception or change through the Incarnation. He remained eternally God while entering human history. This truth preserves the identity of Jesus Christ as the divine Savior who accomplishes redemption.
Scripture Connections: John 1:1-3; John 5:18-23; John 10:30; John 17:5; Colossians 2:9; Hebrews 1:1-4.
Article 5: “Consubstantial with Us According to the Manhood”
Chalcedon uses the same theological term to affirm Christ’s complete participation in human nature. He shares the genuine humanity common to other people, while remaining personally distinct from every other human being. This does not mean all people share one individual existence. It means Christ possesses the same kind of human nature that we possess.
Hebrews 2:14 teaches that Christ shared in flesh and blood. Hebrews 2:17 further explains that he became like his brothers so that he could serve as a merciful High Priest. His humanity was real rather than an appearance or temporary disguise.
Because Jesus truly became human, he could obey, suffer, and die as our representative. First Timothy 2:5 identifies him as the one mediator between God and humanity. His complete humanity belongs at the center of the Christian understanding of redemption.
Scripture Connections: Romans 8:3; 1 Timothy 2:5; Hebrews 2:14-18; Hebrews 4:15; 1 John 4:2-3.
Article 6: “In All Things Like Unto Us, Without Sin”
The definition affirms Christ’s genuine likeness to humanity while excluding personal sin. Jesus experienced ordinary human limitations, weakness, suffering, and temptation. However, he never disobeyed the Father or possessed the moral corruption associated with fallen humanity.
Hebrews 4:15 states that Christ was tempted as we are, yet remained without sin. First Peter 2:22 likewise affirms that he committed no sin. Sinlessness does not make Christ less human. Instead, it reveals the holiness of the true human life he lived.
Christ’s sinlessness is essential to his saving work. As the righteous Savior, he offered himself for sinners rather than requiring redemption for his own wrongdoing. Second Corinthians 5:21 connects his sinlessness with God’s provision of reconciliation through him.
Scripture Connections: John 8:46; 2 Corinthians 5:21; Hebrews 4:15; Hebrews 7:26-27; 1 Peter 2:22; 1 John 3:5.
Article 7: “Begotten Before All Ages of the Father According to the Godhead”
This statement affirms the eternal existence and divine sonship of Jesus Christ. The Son did not begin to exist when Mary conceived him. He existed eternally with the Father before creation and entered human history through the Incarnation.
The expression begotten before all ages describes the Son’s eternal relationship with the Father. It does not refer to a beginning in time or a created origin. John 1:1-3 identifies the Word as existing in the beginning and participating in creation, while John 17:5 speaks of his glory with the Father before the world existed.
The eternal Son is the same person who later became human. His divine identity remains unchanged throughout his earthly life, death, resurrection, and exaltation. The definition therefore preserves the continuity between Christ’s eternal existence and his saving mission.
Scripture Connections: John 1:1-3; John 8:58; John 17:5; Colossians 1:15-17; Hebrews 1:1-3.
Article 8: “Born of the Virgin Mary, the Mother of God, According to the Manhood”
The definition next confesses Christ’s genuine human birth from Mary. Matthew 1:18-25 and Luke 1:26-35 describe his conception through the power of the Holy Spirit. Galatians 4:4 likewise identifies the Son as born of a woman.
The expression Mother of God translates the Greek word Theotokos, meaning God-bearer. Its central purpose in the fifth-century controversy was Christological. It affirms that the person born from Mary was the eternal Son of God incarnate, not a separate human person later joined to the divine Word.
The title does not mean that Mary created God’s divine nature or gave the eternal Son his existence. Mary gave birth to Christ according to his humanity. The one she bore, however, was truly the eternal Son who had assumed human nature.
The definition uses this language to defend the unity of Christ’s person. Luke 1:43 also records Elizabeth addressing Mary as the mother of her Lord. The emphasis remains upon the identity of Jesus Christ and the reality of his Incarnation.
Scripture Connections: Matthew 1:18-25; Luke 1:26-43; John 1:14; Galatians 4:4-5; Philippians 2:6-8.
Article 9: “One and the Same Christ, Son, Lord, Only-Begotten, to Be Acknowledged in Two Natures”
This statement brings the definition’s central teaching into focus. Jesus Christ is one person in two natures: divine and human. The natures are distinct, but they do not create two separate persons or two independent Sons.
A nature describes what Christ is, while person identifies who he is. According to his divine nature, Christ is eternal, almighty, and uncreated. According to his human nature, he possesses a real body and soul and experienced genuine human development, suffering, and death.
The wording in two natures became especially important during the council’s discussions. Earlier language describing Christ as from two natures emphasized the divinity and humanity united in the Incarnation. Chalcedon’s formulation also safeguards their continuing distinction after that union. Christ remains fully divine and fully human in the unity of his person.
The union of these two natures in one person is commonly called the hypostatic union. John 1:14 and Philippians 2:5-8 provide essential biblical foundations for this doctrine. The eternal Son assumed human nature without ceasing to possess his divine nature.
Chalcedon protects both truths together: Christ’s divine and human natures remain complete, and the person of Jesus Christ remains one.
Scripture Connections: John 1:1-14; Romans 1:3-4; Philippians 2:5-11; Colossians 2:9; Hebrews 2:14-18.
Article 10: “Inconfusedly, Unchangeably, Indivisibly, Inseparably”
These four expressions form the most famous part of the Chalcedonian Definition. They describe how Christ’s two natures are united while protecting both their distinction and the unity of his person.
| Historical expression | Meaning |
|---|---|
| Without confusion | Divinity and humanity are not blended into a third nature |
| Without change | Neither nature is transformed into the other |
| Without division | Christ is not divided into two separate persons |
| Without separation | The divine and human natures remain united in the one Christ |
The first two expressions protect the integrity of Christ’s divine and human natures. His humanity does not become divine by being absorbed into the Godhead, and his divinity does not change into humanity. Both remain complete within the Incarnation.
The final two expressions protect the unity of Christ’s person. Jesus is not a divine individual cooperating with a separate human individual. The one eternal Son acts through both natures according to their proper characteristics.
The four safeguards establish boundaries for understanding the Incarnation without claiming to explain its mystery completely. Scripture reveals the reality of Christ’s deity and humanity, while Chalcedon gives precise language to defend their unity.
Scripture Connections: John 1:14; John 10:30; Philippians 2:5-8; Colossians 2:9; Hebrews 1:3; Hebrews 2:14-18.
Article 11: “The Distinction of Natures Being by No Means Taken Away by the Union”
The definition explains that the Incarnation does not erase the distinction between Christ’s divinity and humanity. Each nature retains its own essential characteristics while belonging to the same person.
As God, the eternal Son remains uncreated and possesses divine power and glory. As man, Jesus experienced hunger, weariness, suffering, and death. These human experiences were genuine, but they did not alter his eternal divine nature.
For example, John 4:6 describes Jesus becoming weary from his journey, while John 1:3 identifies him as the divine Word through whom everything was made. Both statements concern the same Jesus Christ. His humanity is real, and his deity remains complete.
This distinction also explains how the Son of God could suffer and die. The person who suffered was truly the divine Son incarnate, yet he suffered and died according to his human nature. The divine nature itself did not become mortal or cease to exist.
Scripture Connections: Matthew 4:2; John 1:1-14; John 4:6; John 11:35; Philippians 2:6-8; Hebrews 4:15.
Article 12: “Concurring in One Person and One Subsistence, Not Parted or Divided Into Two Persons”
This statement firmly protects the unity of Jesus Christ. The word subsistence refers to the concrete personal reality of Christ, closely related to the Greek theological term hypostasis. The definition teaches that the divine and human natures belong to one personal subject, the eternal Son of God.
Jesus’ actions cannot be assigned to two independent individuals. The same Christ who performed miracles also experienced sorrow and suffering. The same person who existed before Abraham also died upon the cross according to his humanity.
First Corinthians 2:8 speaks of the Lord of glory being crucified. The passage identifies the crucified one with the divine Lord rather than describing a merely human person separate from him. Acts 20:28 also connects God’s saving work with the blood shed in Christ’s death.
The unity of Christ’s person matters because salvation is accomplished by the incarnate Son himself. The Savior is one Lord Jesus Christ, not two persons acting together.
Scripture Connections: John 1:14; John 8:58; Acts 20:28; 1 Corinthians 2:8; Philippians 2:5-11; Hebrews 2:14-17.
Article 13: “God the Word, the Lord Jesus Christ, as the Prophets and the Creed of the Fathers Have Delivered”
The definition concludes by connecting its teaching with Scripture and the faith previously confessed by Christians. The bishops did not understand their statement as introducing a different Savior. They intended to defend the identity of Jesus Christ revealed in the biblical writings and affirmed in earlier Christian confessions.
John 1:1-14 identifies Jesus as the eternal Word who became flesh. Isaiah 9:6-7 describes the promised ruler through divine and royal titles, while Micah 5:2 connects the coming ruler with ancient origins. The New Testament presents Jesus as the fulfillment of God’s promises.
The council also reaffirmed the Nicene confession and drew upon earlier Christian teaching. The authority of Christian doctrine rests ultimately upon God’s revelation in Scripture. Chalcedon’s lasting significance comes from its attempt to express that biblical teaching faithfully and protect the confession of one Lord Jesus Christ.
Scripture Connections: Isaiah 9:6-7; Micah 5:2; John 1:1-14; Luke 24:44-47; Philippians 2:5-11; Hebrews 1:1-4.
Important Theological Terms in the Definition of Chalcedon
| Term | Meaning |
|---|---|
| Christology | The study of Jesus Christ’s identity, person, natures, and work |
| Incarnation | The eternal Son of God becoming truly human |
| Divine nature | Everything essential to being God |
| Human nature | Everything essential to genuine humanity |
| Hypostatic union | The union of Christ’s divine and human natures in one person |
| Hypostasis | Greek term used for an individual person or concrete personal subsistence |
| Consubstantial | Sharing the same essence or nature |
| Theotokos | God-bearer; a title affirming that Mary’s son is God the Word incarnate |
| Apollinarianism | Teaching that compromises Christ’s complete human rational soul or mind |
| Nestorianism | A name historically applied to teachings understood to divide Christ into two personal subjects |
| Eutychianism | Teaching associated with a confusion or loss of the distinction between Christ’s two natures |
| Miaphysitism | Christological language emphasizing one united incarnate nature of God the Word, while affirming complete divinity and humanity |
| Chalcedonian Christology | The confession of one Christ in two complete natures without confusion, change, division, or separation |
These terms help explain the doctrinal distinctions behind Chalcedon. The definition does not replace biblical language but seeks to protect the biblical teaching of Christ’s complete divinity, humanity, and personal unity.
The Four Safeguards of Chalcedon: Why They Matter
The definition’s four famous expressions deserve particular attention because each protects a necessary part of Christian belief.
Without Confusion and Without Change
These statements preserve the difference between Christ’s divine and human natures. His humanity is not absorbed into his divinity, and his divinity does not become something less than God.
A confused or blended nature would undermine the confession that Christ truly shares our humanity. Likewise, a divine nature that changes into humanity would compromise his eternal divine identity.
The Incarnation unites complete divinity and complete humanity without transforming either into a different nature.
Without Division and Without Separation
These statements protect the unity of Christ’s person. Jesus is not a human person merely associated with a separate divine person. The one born of Mary is the same eternal Son who existed with the Father before creation.
This unity extends throughout Christ’s earthly life and saving work. The one who suffered and died was the incarnate Son, and the one who rose from the dead remains that same Lord.
Christ’s two natures are distinct, but the Savior himself is one. This is the central balance that the Chalcedonian Definition seeks to preserve.
Why Christ’s Full Divinity and Humanity Matter for Salvation
Chalcedon’s teaching has direct significance for the Christian gospel. The identity of the Savior determines the nature and effectiveness of his saving work.
Christ Must Be Truly Human: Hebrews 2:14-18 teaches that the Son shared flesh and blood to accomplish redemption. His genuine humanity allowed him to live in obedience, suffer, die, and represent those he came to save. A Savior who merely appeared human could not fulfill this biblical description.
Christ Must Be Truly Divine: John 1:1-14 identifies the Savior as the eternal Word who became flesh. Colossians 2:9 affirms the fullness of deity in Christ. His saving work is the action of the divine Son, revealing God’s grace and providing redemption through the one Lord Jesus Christ.
Christ Must Be One Person: First Timothy 2:5 identifies Jesus Christ as the one mediator between God and humanity. His saving work cannot be divided between two independent persons. The same eternal Son who assumed human nature accomplished redemption through his obedience, death, and resurrection.
Salvation Is God’s Gift of Grace: Ephesians 2:8-10 teaches that salvation comes through grace rather than human achievement. The doctrine of the Incarnation explains the identity of the Savior who accomplished that redemption. Chalcedon therefore safeguards essential truths about the person of Christ upon whom Christian salvation depends.
Historical Christian Reception
The Definition of Chalcedon became a foundational statement for much of historic Christianity. However, its reception also produced lasting disagreements among Christian communities.
Cyril of Alexandria and the Unity of Christ
Cyril of Alexandria died in AD 444, before the Council of Chalcedon. Nevertheless, his Christological writings strongly influenced the council’s theological discussions.
Cyril emphasized the unity of the incarnate Son and rejected explanations that divided Christ into separate subjects. His letters to Nestorius and John of Antioch became important sources in the council’s proceedings.
The definition’s insistence upon one and the same Son reflects this concern. Chalcedon sought to preserve Cyril’s teaching concerning personal unity while also affirming the continuing distinction of Christ’s divine and human natures.
Leo I and the Distinction of Natures
Leo I, bishop of Rome, wrote his Tome to Flavian in AD 449. The letter defended Christ’s full divinity and complete humanity and opposed explanations that confused the two natures.
Leo emphasized that the characteristics proper to each nature remain within the unity of Christ’s person. The council received his letter as a significant expression of orthodox Christology.
His influence is especially evident in Chalcedon’s language concerning the distinct properties of Christ’s divine and human natures.
Eastern Orthodox and Roman Catholic Reception
Eastern Orthodox and Roman Catholic Christianity recognize the Council of Chalcedon as the Fourth Ecumenical Council. Both traditions affirm the definition’s teaching concerning Christ’s complete divinity, complete humanity, and unity of person.
The definition also became important for later theological reflection on Christ’s suffering, divine and human activity, and saving work.
Further doctrinal explanations developed in subsequent centuries. In AD 680–681, the Third Council of Constantinople affirmed that Christ possesses both a divine will and a genuine human will, corresponding to his two natures. This teaching built upon Chalcedon’s confession of Christ’s complete divinity and humanity while preserving the unity of his person.
Protestant Reception of Chalcedon
The Protestant Reformers generally affirmed Chalcedonian Christology. Martin Luther, John Calvin, and other major Reformers maintained the confession that Jesus Christ is one person in two complete natures.
Protestant traditions developed differing explanations of certain aspects of Christ’s presence and the relationship between his two natures. Nevertheless, historic Lutheran, Reformed, Anglican, and many other Protestant churches recognize Chalcedon’s central Christological teaching.
The definition therefore remains an important point of theological agreement among many Christian traditions.
Oriental Orthodox Reception and Historical Disagreement
The Oriental Orthodox churches did not accept the Council of Chalcedon or its Christological definition. These churches include the Coptic, Syriac, Armenian, Ethiopian, Eritrean, and Malankara Orthodox traditions.
Their historical objection concerns the council’s language, proceedings, and reception of earlier Christian teaching. Many Oriental Orthodox theologians follow Cyril’s expression concerning the one incarnate nature of God the Word. This position is commonly described as miaphysite Christology.
Miaphysitism should not automatically be equated with Eutyches’ teaching. Oriental Orthodox churches affirm that Christ is truly divine and truly human. Their theological language emphasizes the unity of the incarnate Word, while Chalcedonian Christianity confesses that the same Christ exists in two distinct natures.
These differences contributed to major divisions within ancient Christianity. Political, linguistic, and ecclesiastical conflicts also affected the reception of the council.
Modern conversations have identified substantial areas of agreement. For example, the 1973 Common Declaration between Pope Paul VI and Coptic Pope Shenouda III affirmed shared belief in Christ’s full divinity and complete humanity. However, important historical and ecclesiastical disagreements remain unresolved.
Common Misunderstandings About the Definition of Chalcedon
Does Chalcedon Teach That Jesus Is Half God and Half Man? | No. The definition teaches that Jesus Christ is fully divine and fully human. He possesses two complete natures united in one person, without either nature being reduced or diminished.
Does Having Two Natures Mean Jesus Is Two Different Persons? | No. Chalcedon explicitly rejects dividing Christ into two persons. The eternal Son possesses both divine and human natures while remaining one Lord Jesus Christ.
Does the Incarnation Mean God Stopped Being God? | No. The eternal Son did not surrender or change his divine nature. He assumed complete human nature while remaining fully divine.
Did Jesus Have a Real Human Mind and Soul? | Yes. The definition explicitly affirms a rational soul and body. Jesus possessed complete humanity, including genuine human thought, understanding, and experience.
Does Calling Mary “Mother of God” Mean She Created God? | No. The title Theotokos identifies the person born from Mary as the eternal Son incarnate. It does not mean that Mary originated God’s divine nature or existed before the eternal Son.
If Jesus Is God, How Could He Suffer and Die? | The one who suffered was truly the divine Son, but he suffered and died according to his human nature. His divine nature remained eternal and unchanged. This distinction protects both Christ’s genuine suffering and his full divinity.
Did Chalcedon Invent the Belief That Jesus Is God and Man? | No. The New Testament already presents Christ as truly divine and truly human. Chalcedon developed precise theological language to defend those biblical teachings against disputed interpretations.
Do Oriental Orthodox Christians Deny That Jesus Is Fully Human? | No. Oriental Orthodox churches affirm Christ’s complete humanity and divinity. Their disagreement with Chalcedon concerns the language and interpretation of Christ’s united natures, together with historical disputes surrounding the council.
Does the Definition of Chalcedon Replace Scripture? | No. The definition is a historical explanation of Christian doctrine. Scripture remains the authoritative foundation for understanding the person and saving work of Jesus Christ.
Why the Definition of Chalcedon Matters Today
A Clear Understanding of Jesus Christ: The definition helps Christians understand who Jesus truly is. It affirms his complete deity, full humanity, and unity of person. These truths provide a foundation for reading the Gospels and understanding the person revealed throughout the New Testament.
A Foundation for Understanding Salvation: Christ’s divine and human natures are essential to his saving work. As truly human, he represents sinners and accomplishes redemption through his obedience and sacrifice. As truly divine, he is the eternal Son whose saving work reveals God’s grace and power.
Protection Against Confusing Teachings: Chalcedon’s four safeguards provide a useful framework for evaluating explanations of the Incarnation. They help readers recognize teachings that diminish Christ’s humanity, compromise his divinity, or divide his person. These distinctions remain important for faithful Christian teaching.
A Connection to Historic Christian Belief: The definition connects modern believers with centuries of Christian theological reflection. It also reveals areas of shared faith across many Christian traditions. Studying its history encourages both doctrinal conviction and a fair understanding of genuine historical disagreements.
A Resource for Worship and Discipleship: The Incarnation reveals God’s extraordinary grace toward humanity. The eternal Son became truly human to accomplish salvation through his life, death, and resurrection. Understanding this truth deepens Christian worship, strengthens confidence in Christ, and encourages faithful discipleship.
Questions for Personal and Group Study
- Why did the Council of Chalcedon need to explain Christ’s divine and human natures more precisely than earlier creeds?
- What does it mean that Jesus Christ is fully God and fully man, united in one person?
- How do the four expressions “without confusion, without change, without division, and without separation” protect the biblical teaching of the Incarnation?
- Why does Christ’s complete humanity, including his rational soul and body, matter for his saving work?
- How does the Definition of Chalcedon help Christians understand the suffering, death, resurrection, and continuing reign of Jesus Christ?
Definition of Chalcedon Scripture Reference Guide
| Teaching | Key biblical passages |
|---|---|
| Eternal identity of the Son | John 1:1-3; John 17:5; Hebrews 1:1-4 |
| Full divinity of Christ | John 10:30; John 20:28; Colossians 2:9 |
| Complete humanity of Christ | Luke 2:52; John 4:6; Hebrews 2:14-18 |
| Incarnation | John 1:14; Galatians 4:4-5; Philippians 2:5-8 |
| Christ’s genuine human experience | Matthew 4:2; Matthew 26:38; Hebrews 4:15 |
| Christ’s sinlessness | 2 Corinthians 5:21; Hebrews 4:15; 1 Peter 2:22 |
| Eternal divine sonship | John 1:1-18; John 8:58; Hebrews 1:1-3 |
| Birth from Mary | Matthew 1:18-25; Luke 1:26-43; Galatians 4:4 |
| Unity of Christ’s person | John 1:14; Philippians 2:5-11; Colossians 2:9 |
| Divine and human characteristics | John 4:6; John 11:35; Hebrews 1:3; Hebrews 2:14 |
| Christ’s suffering and death | John 19:16-42; 1 Corinthians 2:8; 1 Peter 2:24 |
| Christ as mediator and Savior | Romans 5:6-11; 1 Timothy 2:5; Hebrews 7:25 |
| Salvation through grace | Ephesians 1:7; Ephesians 2:8-10; Titus 3:4-7 |
| Resurrection and heavenly reign | Acts 1:9-11; Philippians 2:9-11; Hebrews 1:3 |
For additional biblical study, explore the Good Way Library’s Matthew 1 Commentary, Hebrews 1 Commentary, John 14 Commentary, and 1 John 1 Commentary.
These studies examine the Incarnation, Christ’s divine identity, his relationship with the Father, and the reality of his humanity revealed to the apostles.
Readers may also explore the Apostles’ Creed Explained for an introduction to foundational Christian beliefs.
Primary Sources and Further Reading
The following historical texts provide access to the Definition of Chalcedon, its background, and important early Christian writings.
- The Definition of Chalcedon: Historical Text | Philip Schaff, Creeds of Christendom, Volume II. The Greek, Latin, and historical English forms of the Chalcedonian confession.
- Council of Chalcedon, AD 451 | Nicene and Post-Nicene Fathers, Second Series, Volume XIV. Council proceedings, the complete Definition of Faith, and important associated documents.
- The Council of Ephesus, AD 431 | Historical proceedings concerning Nestorius, Cyril of Alexandria, and the earlier controversies about Christ’s person.
- Cyril of Alexandria: Letter to John of Antioch | Preserved within the Council of Chalcedon’s proceedings. An important witness to the reconciliation of AD 433 and the confession of Christ’s divinity and humanity.
- Leo’s Tome to Flavian | Preserved within the council documents. Leo’s explanation of the distinction and unity of Christ’s divine and human natures.
- The Fourth Ecumenical Council | Orthodox Church in America. A historical explanation of Chalcedon’s teachings and its relationship to earlier councils.
- Common Declaration of Pope Paul VI and Pope Shenouda III, 1973 | A historical statement expressing substantial shared Christological faith between Catholic and Coptic Orthodox leaders.
- The Good Way Commentary Library | Free chapter-by-chapter Bible commentary for studying the biblical teachings underlying historic Christian Christology.
The Definition of Chalcedon remains a foundational confession of the identity of Jesus Christ. Its teaching preserves the biblical truth that the eternal Son is fully God and fully man, united in one person. Through Scripture, Christians can better understand the Incarnation, the saving work of Christ, and the grace of God revealed in the one Lord Jesus Christ.
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