BOOK SUMMARY: KNOW THE HERETICS - CHAPTER 8 - APOLLINARIUS

HISTORICAL BACKGROUND - In the century following the Council of Nicaea (AD 325), the church wrestled intensely with how Christ’s humanity and deity unite in one person. Nicaea had already affirmed Christ’s full deity (“very God of very God”) and true humanity (“the man Jesus Christ”), rejecting Arianism’s claim that the Son was a created being. Yet other heresies—such as Docetism and Gnosticism—forced theologians to clarify that Jesus was not merely divine appearing human, but genuinely human. The unresolved question was how Christ’s divine nature and human nature relate within one person. This debate continued for over a hundred years until the Council of Chalcedon (AD 451) articulated the orthodox confession: Christ is one person in two natures, fully God and fully man.
    Two major theological traditions shaped the debate. The Alexandrian school emphasized what happened to human nature when God became man, often stressing the transformative and elevating effect of the incarnation. This “Word–flesh” Christology focused on how the divine Word united with human flesh to create something gloriously new. In contrast, the Antiochene school insisted on the full integrity of Christ’s humanity, including a human mind, human desires, and a complete human psychology. Their “Word–man” Christology emphasized that the Logos united with a full human person, not merely a human nature. Both schools sought to defend orthodoxy, but their extremes produced heresies: Nestorius divided Christ into two persons, while Apollinarius blurred the natures into something less than fully human. 

HERETICAL TEACHING: APOLLINARIANISM - Apollinarius of Laodicea (d. 390) vigorously opposed Antiochene Christology and sought to defend Christ’s deity against any hint of subordinationism. He insisted that Christ must be fully divine and rejected any teaching that seemed to divide Christ’s person. Influenced by a Platonic understanding of human nature—body, sensitive soul, and rational mind—Apollinarius argued that Christ assumed a human body and sensitive soul, but not a human rational mind. Instead, the divine Logos replaced the human rational soul. To Apollinarius, this protected Christ from having a human will, which he believed would necessarily be sinful. His Christ was therefore “God-incarnate,” “flesh-bearing God,” but not fully human.
    Apollinarius emphasized divine immutability, impassibility (no emotional or inner turmoil), and omniscience. Because God cannot change, suffer, or be limited, Apollinarius believed it was impossible for the divine Son to assume a full human psychology. Thus, Christ’s humanity was dependent on and overridden by his deity. Jesus was, in Apollinarius’s system, two-thirds human—a human body and soul animated by the divine Logos instead of a human rational mind. This made Christ’s humanity incomplete and undermined the biblical teaching that Christ was like us “in every respect” except sin.

ORTHODOX RESPONSE - The church quickly recognized that Apollinarianism compromised salvation. If Christ lacked a human mind, then the human mind was not redeemed. Gregory of Nazianzus famously argued, “What has not been assumed has not been healed.” Christ must possess a full human nature—body, soul, and rational mind—to redeem the whole human person. Multiple councils condemned Apollinarianism: Rome (377), Alexandria (378), Antioch (379), and finally the Council of Constantinople (381), which ended the controversy and reaffirmed Christ’s full humanity and full deity.
    Gregory insisted that Christ must be fully human to be the true Second Adam. Only a complete human nature—body, soul, intellect—could be united to the divine nature without confusion or division. Orthodox Christology therefore teaches that Christ is one person with two natures, divine and human, without mixture, change, division, or separation. This preserves both the unity of Christ’s person and the integrity of his humanity.
 
CONTEMPORARY RELEVANCE - Modern thinkers such as John A. T. Robinson have observed that many Christians unintentionally slip into Apollinarian thinking, imagining Jesus as God “dressed up” as a man rather than truly human. This reduces Christ’s humanity to a costume and undermines the reality of his temptations, suffering, obedience, and priestly mediation. The church must continually guard against minimizing Christ’s humanity, remembering that salvation depends on the full incarnation: “He had to be made like his brothers in every respect” (Heb. 2:17–18).
 
DISCUSSION QUESTIONS
1.    How does Gregory’s statement “What has not been assumed has not been healed” help us understand the necessity of Christ’s full humanity? Philippians 2:5–8; Hebrews 4:15
 
2.    What dangers arise when Christians unintentionally think of Jesus as “God disguised as a man”? John 1:14; 1John 4:2–3
 
3.    Why is it essential that Christ have a human will that is perfectly submitted to the Father? Luke 22:42; John 6:38,Romans 5:19; Hebrews 5:8
 
4.    How does the incarnation demonstrate both the humility of Christ and the love of God? Philippians 2:6–8; John3:16
 
5.    In what ways does Christ’s full humanity comfort believers who struggle with temptation and weakness? Hebrews4:14–16; Matthew 4:1–11
 
6.    How would you counsel a believer who feels Jesus cannot truly understand their mental or emotional suffering because “He was God, not really human like me”? Hebrews 4:15; Hebrews2:17–18; John 11:33–36
 
7.    How would you guide someone who believes their thoughts, desires, or will are beyond Christ’s healing because “Jesus didn’t have a human mind like ours”? Romans 12:2; Philippians 2:5; 2Corinthians 10:5
 
8.    Why must you—the church--teach new believers and children a balanced view of Christ’s humanity and deity? 2Timothy 1:13–14; Jude 3

9.    How does Christ’s full humanity—His real human mind, emotions, and experiences—shape the way we practice Spirit‑empowered koinōnia (fellowship) with one another, especially in seasons of suffering or weakness? 1 John 1:3; 2 Corinthians 1:3-7