True God and True Man: Why the Identity of Jesus Matters
Christianity stands or falls with the identity of Jesus. The apostolic witness and the ancient councils confess one and the same Son: eternally God, truly human, born from Mary, crucified, risen, and able to save because he is both.
The Savior must be truly God to give God's own life and truly human to heal, represent, and raise humanity. Scripture therefore permits neither a lesser divine intermediary nor a divine appearance wearing human flesh.
The question at Caesarea Philippi
Near Caesarea Philippi, Jesus asked his disciples who people said he was. The answers were honorable: John the Baptist, Elijah, Jeremiah, another prophet. Then came the sharper question: "Who do you say that I am?" Peter answered, "You are the Messiah, the Son of the living God" (Matthew 16:13–16).
The Church spent centuries learning how much that answer contained. Jesus is Messiah, yet greater than a merely human king. He is Son, yet not a second god beside the Father. He is born, hungry, tired, sorrowful, wounded, and dead, yet the New Testament places him within the identity and work of the Creator. Christian doctrine did not solve the difficulty by choosing one side. It confessed one Jesus who is true God and true man.
The preexistent and divine Son
Jesus' story does not begin in Mary's womb. Paul speaks of Christ existing in the form of God before taking the form of a servant and being born in human likeness (Philippians 2:6–8). John begins before creation: the Word was with God, was God, and made all things; then the Word became flesh (John 1:1–3, 14). Jesus asks the Father to glorify him with the glory he had beside the Father before the world existed (John 17:5).
Preexistence alone would not establish full deity; angels also exist before many earthly events. The New Testament goes further. All things are created through Christ and for him, and all things hold together in him (Colossians 1:16–17). He sustains all things by his powerful word (Hebrews 1:3). Passages about the Lord of Israel are applied to him (Romans 10:9–13; Hebrews 1:10–12). He receives worship and prayer, forgives sins, judges humanity, and is addressed as Lord and God (John 20:28).
The earliest recoverable Christian sources already contain exalted Christology. Paul's undisputed letters, written decades before the later Gospels and centuries before Nicaea, include Christ within worship, creation, Israel's confession, and salvation. Scholars differ over the development and categories of early Christology, but a theory in which Jesus remained only a human teacher until the fourth century cannot account for the evidence.1
The complete humanity of Jesus
The Word "became flesh" (John 1:14). In biblical usage, flesh here means genuine human existence, not a costume. Jesus is born and grows (Luke 2:7, 40, 52). He is hungry (Matthew 4:2), thirsty (John 19:28), tired (John 4:6), troubled (John 12:27), grieved (Mark 14:34), and subject to death. After rising, he identifies his body, invites touch, and eats before his disciples (Luke 24:39–43).
His humanity includes a human mind, affections, and will. Luke says he grew in wisdom. Hebrews says he learned obedience through suffering, without implying prior sin (Hebrews 5:8). In Gethsemane he prays, "not my will but yours be done" (Luke 22:42). Later Christian debate would clarify that Christ possesses a human will proper to his humanity, always freely aligned with his divine will. A humanity without a rational mind or will would be incomplete.
Jesus is without sin (Hebrews 4:15; 1 Peter 2:22). Sinlessness does not make him less human. Sin is a corruption of humanity, not its defining ingredient. In Christ, humanity appears as it was meant to live: faithful to the Father, filled with the Spirit, loving unto death.
The virginal conception
Matthew and Luke independently frame their infancy narratives around a conception by the Holy Spirit while Mary is a virgin (Matthew 1:18–25; Luke 1:26–38). Their narratives differ in perspective and detail, and historians discuss their sources, chronology, and relation to Isaiah 7:14. The doctrine should be confessed on the testimony of these Gospels without pretending that ancient historical inquiry can reproduce the event.
Christ is not divine because he had no human father. He is the eternal Son before his conception. Nor did the Holy Spirit replace a human paternal contribution in a quasi-biological union with Mary. The narratives describe divine creative action, not divine sexuality. From Mary the Son assumes real humanity; by the Spirit his conception occurs as God's free act.
The virginal conception signals initiative and identity. Salvation begins with God's grace. The child is conceived within Israel and truly descends from Mary, yet his personal subject is the eternal Son. The doctrine also distinguishes incarnation from adoption: God did not select an already existing man and promote him into sonship.
Four councils, one confession
Nicaea in 325: true God
Nicaea answered accounts that made the Son a creature. Its creed calls him "true God from true God," "begotten, not made," and homoousios with the Father. The council's main question concerned the Son's divine status and eternal relation to the Father. It did not supply the later, full vocabulary of christological union.2
Constantinople in 381: complete humanity and the divine Spirit
Apollinarius of Laodicea defended Christ's deity but treated the divine Word as taking the place of a rational human mind. Gregory of Nazianzus answered with a rule that became famous: what has not been assumed has not been healed. Constantinople rejected Apollinarian teaching and reaffirmed the Nicene faith, while the creed associated with the council confesses that the Son "became human" and the Spirit is Lord and life-giver.3
Ephesus in 431: one personal subject
The dispute between Cyril of Alexandria and Nestorius of Constantinople centered partly on the title Theotokos, "God-bearer" or "Mother of God." The title does not claim that Mary generated the divine nature or existed before God. It identifies the one she bore: the child born from her is God the Word incarnate.
Historical Nestorius is harder to classify than the later label "Nestorianism" suggests. He affirmed Christ's deity and humanity and objected to expressions he believed confused them. Cyril feared that Nestorius's language divided Christ into two acting subjects joined by association. Ephesus received Cyril's second letter to Nestorius and condemned Nestorius, affirming the unity of the incarnate Son. Political rivalry and procedural disorder accompanied the council, but they do not exhaust its theological issue.4
Chalcedon in 451: one person in two natures
Chalcedon confessed "one and the same Son," complete in deity and complete in humanity, consubstantial with the Father according to deity and with us according to humanity, known in two natures "without confusion, without change, without division, without separation." The four adverbs form protective fences. The first pair guards the integrity of each nature; the second guards the unity of the person.5
The councils do not add a second Jesus to the Gospels. They clarify how the same Jesus can sleep in the boat and command the sea, grow in wisdom and know the Father uniquely, die in the flesh and give life to the dead.
A necessary caution about "monophysite"
It is inaccurate to treat every non-Chalcedonian or Oriental Orthodox church as teaching that Christ's humanity was swallowed by divinity. Eutyches was accused of denying that Christ is consubstantial with us after the union. Oriental Orthodox traditions generally reject Eutychian confusion and describe their position as miaphysite, drawing on Cyril's formula of one incarnate nature of God the Word. Modern ecumenical dialogues have found substantial agreement in confessing complete deity, complete humanity, and an unconfused union, although ecclesial division and disagreements about conciliar reception remain.6
What the rejected alternatives lose
- -Adoptionism makes Jesus a human being chosen or elevated as Son. It cannot account adequately for preexistence, creation through Christ, or eternal glory with the Father.
- -Arianism grants the Son a place above other creatures while still placing him among creatures. Worship then terminates on one who is not the true God, and the creature cannot communicate God's own life.
- -Docetism says Christ only seemed human or seemed to suffer. It removes the actual human obedience, death, and bodily resurrection at the center of the gospel.
- -Apollinarianism protects unity by leaving Christ without a complete human rational soul or mind. What is unassumed remains unhealed.
- -Unity-splitting tendencies so separate divinity and humanity that the Gospels appear to contain two subjects, one divine and one human. Then Mary bears a human partner rather than the Word incarnate, and the one who suffers is detached from the one who saves.
- -Eutychian confusion blurs the natures after the union. If Christ's humanity no longer remains genuinely human, he is no longer consubstantial with us.
These labels should describe claims, not serve as insults. Ancient figures often wrote in changing vocabularies, and their opponents preserved part of the evidence. Historical precision requires distinguishing a later textbook category from everything a named person may have believed.
Why salvation depends on who Christ is
The New Testament does not present incarnation as an intellectual puzzle detached from redemption. "The Word became flesh" so that human beings might receive adoption and see God's glory (John 1:14–18). The Son shares flesh and blood to destroy death and free those held by its fear (Hebrews 2:14–18). The last Adam becomes life-giving and raises those who bear his image (1 Corinthians 15:45–49).
Only God saves in the full biblical sense (Isaiah 43:11), yet Jesus saves, forgives, gives eternal life, and raises the dead. His divine identity explains the scale of his work. Salvation is communion with God, not a reward delivered by a creature standing outside God's life.
He also must belong fully to us. Hebrews grounds his priesthood in shared humanity, temptation, suffering, and faithful obedience. Paul places redemption within representative humanity: as death came through Adam, resurrection comes through Christ (Romans 5:12–21; 1 Corinthians 15:21–22). A divine visitor who never possesses a human mind, will, body, and history cannot restore human nature from within.
The cross belongs to the one person of the Son. Christians can therefore say that the Lord of glory was crucified (1 Corinthians 2:8) and that God purchased the Church through blood associated with his own Son (Acts 20:28, whose textual and translational details are debated). The divine nature does not bleed or die. The divine person truly suffers death according to the humanity he made his own. This is the grammar of incarnation.
Modern non-Nicene alternatives
Jehovah's Witnesses regard Jesus as the first of God's creations rather than as the uncreated Son. Latter-day Saints honor Jesus as divine and preexistent but place him within a theology of separate divine beings and premortal spirit existence unlike Nicene eternal generation. Islam calls Jesus Messiah, word from God, and messenger while denying that he is the divine Son and, in mainstream interpretation, denying his crucifixion. Modern adoptionist or purely humanitarian readings treat Jesus as inspired teacher, prophet, or revolutionary figure without divine preexistence.
Each position may say true things about Jesus: he teaches, obeys, is sent, serves, and is distinguished from the Father. The question is whether it can also account for creation through him, worship directed to him, his sharing of divine glory and name, his authority over final judgment, and the apostolic claim that God acted personally in him to reconcile the world.
What we can say confidently
- -The New Testament presents Jesus as genuinely human in body, experience, mind, will, suffering, death, and resurrection.
- -It also presents him as preexistent and places him within divine creation, sovereignty, worship, and salvation.
- -Matthew and Luke affirm a virginal conception by the Holy Spirit.
- -Nicaea defended the Son's full deity; Constantinople rejected an incomplete humanity; Ephesus defended the unity of the incarnate subject; Chalcedon confessed one person in two complete natures.
- -Christian salvation is tied to Christ's identity as the divine Son who truly shares human nature.
What remains disputed or uncertain
- Historians debate the development of early Christological language and the exact beliefs fairly attributable to Arius, Nestorius, Eutyches, and their followers.
- The historical and literary questions surrounding the infancy narratives remain debated.
- Chalcedonian and Oriental Orthodox churches continue to differ over conciliar reception, even where modern statements find close christological agreement.
- No analogy or psychological model fully explains the hypostatic union. The councils state boundaries drawn from revelation more than a mechanism.
Reflection
The one who meets us in the Gospels is neither remote deity nor disposable messenger. He touches lepers with a human hand, weeps at a human grave, and carries human flesh through death into life. Yet the hand belongs to the one through whom the world was made. The tears are the tears of the eternal Son.
Because he is God, his grace opens communion with God. Because he is human, that communion does not erase humanity; it heals and glorifies it. Christ saves no abstraction. He saves human beings, body and soul, by joining our life to his.
Endnotes/Sources:
- Larry W. Hurtado, Lord Jesus Christ (Eerdmans, 2003); Richard Bauckham, Jesus and the God of Israel (Eerdmans, 2008); Gordon D. Fee, Pauline Christology (Hendrickson, 2007).
- Creed of Nicaea (325), in Norman P. Tanner, ed., Decrees of the Ecumenical Councils, vol. 1 (Georgetown University Press, 1990).
- Gregory of Nazianzus, Letter 101; Lewis Ayres, Nicaea and Its Legacy (Oxford University Press, 2004).
- Cyril of Alexandria, Second Letter to Nestorius; Council of Ephesus (431); John A. McGuckin, Saint Cyril of Alexandria and the Christological Controversy (Brill, 1994; SVS Press reprint, 2004).
- Definition of Chalcedon (451), in Tanner, Decrees; Richard Price and Michael Gaddis, trans., The Acts of the Council of Chalcedon (Liverpool University Press, 2005).
- See the agreed statements gathered in Anglican–Oriental Orthodox and Catholic–Oriental Orthodox dialogues. Agreement does not erase differing judgments about councils, terminology, or communion.
Bibliography
Primary sources
- The Holy Bible.
- Creed of Nicaea; Nicene-Constantinopolitan Creed; Definition of Chalcedon, in Tanner, Norman P., ed. Decrees of the Ecumenical Councils. Vol. 1. Georgetown University Press, 1990.
- Price, Richard, and Michael Gaddis, trans. The Acts of the Council of Chalcedon. 3 vols. Liverpool University Press, 2005.
Ancient Christian sources
- Athanasius. On the Incarnation.
- Cyril of Alexandria. Second Letter to Nestorius.
- Gregory of Nazianzus. Letter 101.
- Leo the Great. Tome to Flavian.
Modern academic sources
- Ayres, Lewis. Nicaea and Its Legacy. Oxford University Press, 2004.
- Bauckham, Richard. Jesus and the God of Israel. Eerdmans, 2008.
- Fee, Gordon D. Pauline Christology. Hendrickson, 2007.
- Grillmeier, Aloys. Christ in Christian Tradition. Vol. 1, 2nd rev. ed. Westminster Press, 1975.
- Hurtado, Larry W. Lord Jesus Christ. Eerdmans, 2003.
- McGuckin, John A. Saint Cyril of Alexandria and the Christological Controversy. Brill, 1994.
- McGrath, Alister E. Christian Theology: An Introduction. 6th ed. Wiley-Blackwell, 2017.
- Price, Richard, and Michael Gaddis. The Acts of the Council of Chalcedon. Liverpool University Press, 2005.
Official sources of traditions discussed
- Catechism of the Catholic Church, pars. 456–483.
- Orthodox Church in America. The Orthodox Faith, “Jesus Christ.”
- The Church of Jesus Christ of Latter-day Saints. “Godhead”; “Jesus Christ.”
- Jehovah's Witnesses. Official teaching pages on Jesus Christ.
- The Qur'an, 3:45–55; 4:157–171; 5:72–75, 116–118.