Christology Study Guide for Final Exam

One Divine Person, Two Natures — Compiled from Class Lecture and Outline

I. INTRODUCTION — "I BELIEVE IN JESUS CHRIST, THE ONLY SON OF GOD" (CCC 422)

A. Christ Is at the Center of Everything

• All catechesis — whether in a classroom, marriage prep, or homily — has one primary goal: to put people in communion with Christ. If that is not the first goal, the catechesis is off.

• Christ is the center, key, and purpose of all of human history (CCC). He came 'in the fullness of time' — a moment historians describe as:

◦ The heights of Greek philosophical thought — demonstrating humanity's natural capacity to reason toward God.

◦ The nadir of Roman decadence (gladiatorial games) — demonstrating the worst that fallen humanity produces.

◦ Practical infrastructure — Roman roads, mapped sea-lanes — enabling Paul's missionary journeys to the Gentiles.

• Christ fulfills human history because He is its key and reason: everything in the material world exists to support the human person so that the human person can have a relationship with God. He shows us why things exist, where history went wrong (the fall), and how to return to the Father. 'We came from love, to journey in love, to return to love.'

• Christ also shows us the Father was saving us from the very beginning — from the protoevangelium (Genesis 3:15) through the choosing of a particular people, the building of a nation, and the preparation for the Messiah.

• Christ is the pattern and plan of what it is to be human. To know what full humanity looks like — including divinized humanity — look to the God-Man. Our saints also show us what this looks like.

B. The Creed as Mini-Economy — Christ at the Center

• The Apostles' Creed and Nicene Creed reflect salvation history in three movements:

◦ God the Father — creation (Age of the Father / Old Testament era).

◦ Jesus Christ — redemption (Age of the Son / the Gospels).

◦ The Holy Spirit — sanctification (Age of the Church / the present era).

• Mary's role tracks these three ages: Mother of God (in relation to the Son), Daughter of the Father (in relation to the Father), Spouse of the Holy Spirit (in relation to the Spirit).

• Even the structure of the Creed shows Christ smack at the center of history.

C. The Name of Jesus

• The name 'Jesus' is reflective of a real historical person who truly walked among us — God has genuinely intersected human affairs.

• 'Jesus' means 'God saves' (Hebrew: Yeshua). Mission and identity are intertwined: His very name announces what He has come to do.

• This is not myth or allegory — Christianity celebrates real, historical events.

• The name itself has power: When the name of Jesus is pronounced in faith, His power is invited into the situation (CCC). Archbishop Shea's insight: even the unwitting pronunciation of the name brings something of Christ's power near. For the believer pronouncing it in faith, it is an invitation to the full exercise of His power.

• The Jesus Prayer: 'Jesus, Son of the living God, have mercy on me, a sinner.' — In this prayer, we name Him as Lord and name ourselves as sinners. Simply pronouncing His name is itself a prayer.

• FOCUS missionaries were trained to use the name frequently in evangelization conversations — recognizing the spiritual power attached to the name.

D. Three Titles of Jesus — Christ, Son, Lord

1. Christ (Christos)

• Greek translation of the Hebrew Messiah — 'Anointed One.'

• In the Old Testament, kings, prophets, and priests were anointed. Anointing signifies being installed into an office that exceeds your natural capacity to carry out — you receive God's grace for the mission.

• Jesus fulfills all three vocations perfectly: He is the perfect Priest (sacrifice and mediation), Prophet (mouthpiece of God), and King (ruler, lawgiver, judge).

• Through Baptism, you and I share in His anointing — we too are priest, prophet, and king.

• Trinitarian form of His anointing: He is anointed BY the Father; He Himself is the Anointed One; and the very anointing is the Spirit. Where one divine person acts, the other two are also present.

• The deliverer the Jews awaited was not meant to liberate them from Rome — but from sin, from the devil, and from the spiritual bondage introduced by the fall.

2. Son (of God)

• Israel as a nation was called 'son of God' corporately. Individual kings, priests, and prophets were also called sons of God — but metaphorically/functionally, not literally.

• Jesus reveals Himself to be the ETERNALLY BEGOTTEN Son of God — a title of an entirely different, literal, and ontological order.

• This title recalls our Trinitarian precision: the Son fully possesses the divine nature but is distinct from the Father. He is God, yet He is not the Father.

• Peter's confession (by the gift of the Holy Spirit), the Transfiguration ('This is my beloved Son'), and the Baptism of Jesus all testify to this Sonship.

• For us: finding our identity as sons of the Heavenly Father, modeled on Christ's own Sonship, is a key element of the Christian life.

3. Lord (Kyrios)

• In the Greek Old Testament (LXX), Kyrios (Lord) replaced the unpronounceable divine name YHWH. By applying this title to Jesus, the New Testament identifies Him directly with YHWH.

• Jews avoided pronouncing YHWH except once a year on Yom Kippur by the High Priest. 'Lord' carried the full weight of divinity.

• Jesus accepts and claims this title explicitly. He says 'I and the Father are one' (John 10:30) and 'before Abraham was, I AM' (John 8:58), directly invoking the divine name.

• This represents the progression in Scripture from Messiah → Son of God → God Himself.

E. Why the Word Became Flesh — The Four Reasons (CCC 457-460)

• God could have saved us any way He chose — He could have 'snapped His fingers.' The Incarnation was gratuitous but fitting. The four reasons:

◦ 1. To expiate our sins / to save and redeem us: The debt of sin is too great for a finite creature to pay — only God can pay an infinite debt. But human debt must also be paid by a human. So He takes on flesh, combining infinite power with human solidarity to make the perfect atonement. He suffers in our place.

◦ 2. To show us the love of the Father: The crucifixion is the supreme revelation of God's agape — total, unconditional self-gift. He was kept on the cross not by the nails but by His love for each individual soul. He opens to us the kenosis of the Trinity: the eternal exchange of love that God IS.

◦ 3. To be our model of holiness: He shows us what it means to be fully, rightly human: obedient, sacrificial, other-centered. 'You want to know what it is to be human? Look to the God-Man.' He coaches us — not just hands us a manual, but lives it out in the flesh.

◦ 4. To make us partakers of the divine nature (divinization): 'That which was not assumed is not saved.' He assumes human nature so that human nature — now seated at the right hand of the Father — can be divinized. Our destiny is participation in the Trinitarian life. He became low so that we might be exalted.

II. THE CHRISTOLOGICAL DOCTRINE OF THE INCARNATION — THE HYPOSTATIC UNION

A. The Mystery Strictly Speaking

• The hypostatic union is a mystery in the strictest theological sense: it could not have been known without being revealed by God, and even after its revelation, it cannot be positively proven by reason alone. We accept it on the authority of God and then use precise terms to understand, explain, and protect it.

• What the doctrine teaches: Jesus Christ, the Second Person of the Trinity (a divine person who fully possesses the divine nature), has taken on — wedded Himself to — a complete human nature. The result is ONE divine person with TWO natures (divine and human) in SUBSTANTIAL UNION.

B. Council of Chalcedon (451 AD) — The Definitive Formula

• 'Following the holy Fathers, we unanimously teach and confess one and the same, our Lord Jesus Christ: the same perfect in divinity and perfect in humanity, the same truly God and truly man, composed of a rational soul and body, consubstantial with the Father as to His divinity and consubstantial with us as to His humanity, like us in all things but sin.'

• Unpacking the four key qualifiers — the two natures come together WITHOUT:

◦ Confusion: The divine nature does not blend with the human nature to produce a third, hybrid nature. Each nature retains its proper character.

◦ Change: Neither nature is transformed into the other. God remains God; humanity remains humanity.

◦ Division: The two natures are not split into two separate beings or operating principles.

◦ Separation: Despite their distinction, the two natures are never divided or torn apart — they are in substantial, permanent, real union.

• 'Begotten of the Father before all ages as to His divinity, and in these last days for us and for our salvation born as to His humanity of the Virgin Mary, the Mother of God. We confess the one and same Christ, Lord and only-begotten Son, to be acknowledged in two natures, without confusion, change, division, or separation, the character proper to each of the two natures preserved as they came together in one person and one hypostasis.'

C. Two Terms: Prosopon and Hypostasis

• Prosopon: Originally meant 'mask' in Greek theater — a personality characteristic or role. A weak term for person, but the Church borrowed it and elevated it. Think of it as 'the face that acts.'

• Hypostasis: Literally 'that which stands under.' The hypostatic union = the two natures standing under the one divine person. The person is the foundation; the natures operate through the person.

• Person (review): The WHO that acts — the agent of action, through and in a nature. Nature is the SOURCE of operations; person DOES them.

• In Christ: The two natures stand under the ONE divine person. It is the divine person of the Son who acts in and through both His divine nature and His human nature.

• Critical exam point: Jesus Christ is a DIVINE person, NOT a human person. He is fully human but He is not a human person. The person is the divine Second Person of the Trinity, who has assumed a complete human nature. Two persons would be Nestorianism (see below).

III. THE CHRISTOLOGICAL HERESIES

• Three (sometimes four) categories: denial of full divinity; denial of full humanity; denial of real union; and a combination category (Arianism/Apollinarianism).

• Knowing what is false clarifies what is true. Each heresy distorts one or more aspects of the hypostatic union.

A. Denial of Full Divinity

1. Adoptionism

• Core claim: Jesus is a human being — a virtuous, gifted man — whom God the Father 'adopts' and empowers. God pours His grace and power upon this man, giving him the tools to carry out a messianic mission.

• In some versions: the adoption/anointing occurs at Jesus' baptism — that is when the Father invests this good man with divine power.

• Analogy: Jesus is like Spider-Man — a regular guy given extraordinary powers. He is greater than Elijah or Elisha by degree, but not by nature. He is never actually God.

• What is missing: His inherent, eternal divinity. He would be a creature — however exalted — not the eternally begotten Son.

• Note: Adoptionism is actually a decent analogy for YOU AND ME — we are adopted sons and daughters of God, given participation in the divine nature through Baptism. But applied to Christ, it is heresy.

• Misused scripture: Romans 1:3-4 — 'descended from David according to the flesh, but was MADE Son of God in power according to the Spirit of holiness by his resurrection from the dead.' Adoptionists read 'made' as proof He was not always divine.

• Refutation of Romans 1:3-4: Scripture must be read in its entirety, not in isolation. Jesus Himself says 'I and the Father are one' (John 10:30) and 'Before Abraham was, I AM' (John 8:58). John 10:18 — 'I lay down my life and I take it back up.' No mere prophet or creature does that.

• Modern equivalents: Jehovah's Witnesses (Christ is the first and greatest created being, anointed at baptism, not inherently divine). Also reflects some strands of liberal Protestant thought.

• Why it matters: If Christ is not truly God, then (1) can He really save us? Can a creature pay our infinite debt? (2) His claims to divinity ('I and the Father are one') make Him a liar or a lunatic. (3) It diminishes the radical love of God — He didn't send an ambassador, He came Himself. The gift tells you what you mean to the giver: coal vs. a diamond.

2. Jewish rejection of Christ's divinity

• Many Jews who remained Jewish held that the Father cannot have a son — it is a metaphysical impossibility.

• Additional scriptural refutations: Jesus completes and changes the Old Law (Matthew 5:21-22 — 'You have heard it said... but I say to you...') — only the lawgiver Himself has authority to do this. He calls Himself 'Lord of the Sabbath' (Matthew 12:8). He makes covenants in His own blood. He forgives sins — something only God can do ('Who can forgive sins but God alone?').

• Historical refutation: The martyrs. All the Apostles except John died horribly for this truth. The first several popes died as martyrs. People do not die for a lie — especially not this many, this consistently, over centuries.

• The Apostolic Fathers and the Creed: The Apostles' Creed and the Nicene-Constantinopolitan Creed both explicitly confess the full divinity of Jesus Christ.

B. Denial of Full Humanity — Docetism

• Name origin: From the Greek dokeo / dokein — 'to appear' or 'to seem.' Docetism: Christ only APPEARS to be a man.

• Core claim: The divine Word did not truly take on a human body. He only appeared human — like an illusion, a projection, a mirage. In its extreme form, God is standing in the crowd at the crucifixion laughing, because what is on the cross is only a projected image.

• Less extreme versions: The Word composed a body from matter to vest Himself with the appearance of humanity (like angels sometimes appear bodily) — but it is not a real human body animated by a real human soul.

• Root cause: Gnostic influence — matter is evil, spirit is good. Therefore God (pure spirit, supreme good) could never truly take on flesh (matter, evil/lesser). To say He did is demeaning to God.

• Why this is still present today (in disguised forms):

◦ Catholics who think 'the body is bad' and 'I can't wait to be free from the body' — forgetting that the body will be raised. This is crypto-docetism.

◦ Warped sexual ethics in marriage prep — treating the body as purely an animal embarrassment rather than a good gift of God.

◦ Protestant lack of sacramentality — 'I don't need the physical stuff (water, oil, bread, wine, etc.), just the spiritual.' This implicitly treats matter as unimportant. The sacramental regime is the INCARNATIONAL PRINCIPLE: flesh is good, and God communicates through matter because that is how embodied creatures learn.

• Key refutations from Scripture:

◦ John 1:14: 'The Word was made FLESH' — not an illusion, not a projection: actual human flesh, which requires an actual human soul to animate it.

◦ 1 John 4:2: 'Every spirit that acknowledges Jesus Christ come in the flesh belongs to God' — testing the spirits by their acknowledgment of the real Incarnation.

◦ 2 John 7: 'Many deceitful men have gone out into the world, men who do not acknowledge Jesus Christ is coming in the flesh. Such is the deceitful one. This is Anti-Christ.' Direct and explicit.

◦ Romans 1:3: 'Descended from David according to the flesh' — real lineage, real bloodline, real genealogy.

• Eucharistic science: Every tested Eucharistic miracle has yielded the same AB positive blood and heart tissue — all with only an X chromosome (no Y chromosome), consistent with a virgin birth from a human mother, with no biological human father.

• Church Fathers: St. Ignatius of Antioch (early 100s, direct disciple of the Apostle John): 'He suffered all these things for our sakes... and he suffered TRULY, even as also he truly raised himself up — not, as certain unbelievers maintain, that he only seemed to suffer.' Very direct condemnation.

• Councils: First Council of Nicaea (325 AD) — 'Jesus became flesh and was made man' — explicit statement.

• St. Gregory of Nazianzus: 'THAT WHICH WAS NOT ASSUMED WAS NOT SAVED.' This is one of the most important phrases in Christology. If He did not truly take on a human body and soul, our body and soul have not been redeemed. Human debt must be paid by a real human — not an illusion.

• Why it matters: (1) The debt would not be paid — an illusion cannot make real atonement. (2) If He was not real, God is a liar and a trickster — destroying any basis for trust. (3) He could not serve as High Priest for us — a priest mediates for his own kind. (4) The Eucharist collapses — if He had no real body, there is no real body to offer. (5) He would not truly understand our suffering — but because He truly suffered, we can say 'Lord, I am hurting.' And He says: 'I know. I have been there. In fact, ten times over.'

C. Heresies That Deny Both Full Humanity and Full Divinity

1. Arianism

• Founder: Arius, 4th century, Alexandria.

• Core claim: The Son is not truly God — He is the first and greatest created being, a semi-divine creature ('a deity' above humanity but below God). God the Father created the Son. 'There was a time when the Son was not.'

• What Arianism destroys in both directions: (1) The Son is less than God — His divinity is degraded to a created power. (2) The Son does not have a complete human nature — Arius said Christ had no human soul; the divine intellect and will of the semi-divine being replaced the soul.

• Image: God is here, humanity is here, and Arianism posits a third in-between 'deity' thing — like a mosquito zapper that then 'zaps' part of the human nature. You end up with something that is neither fully divine nor fully human.

• Council of Nicaea (325 AD): Arius condemned explicitly. The Council defined the Son as consubstantial (homoousios — of the SAME substance) with the Father. One iota of difference — homoiousios ('of like substance') — was the difference between orthodoxy and heresy.

• Famous incident: St. Nicholas (Santa Claus) physically struck Arius at the Council — and was briefly arrested for it. The Emperor Constantine had to intervene to release him because the assembled bishops refused to punish a man defending God's honor.

• Modern equivalent: Mormonism. Mormon theology holds that Christ is a separate and subordinate deity, not co-equal or co-eternal with the Father. The Father, Son, and Holy Spirit are three separate gods in Mormonism. This is a form of Arianism.

• Also: Jehovah's Witnesses — Christ is a created being (identified as Michael the Archangel) superior to us but not truly God.

2. Apollinarianism

• Founder: Apollinarius, 4th century, bishop and friend of St. Athanasius. Motivated by a noble desire to protect the divinity of Christ — but went too far.

• Core claim: The divine Word assumed only a human BODY. The Godhead with its divine intellect and divine will REPLACED the highest part of the human person — the rational soul. Christ had no human soul, no human intellect, no human will.

• Apollinarius' reasoning: He already has a divine will and intellect — why would He need a human will and intellect? He can make atonement through the flesh without a human soul.

• What is lost: The human soul — and with it, the human intellect and will. These are essential to being fully human.

• Scripture refuting Apollinarianism:

◦ Matthew 26:38: 'My soul is sorrowful unto death.' He has a soul.

◦ Luke 23:46: 'Father, into your hands I commit my spirit.' Why commit His spirit if He has no human spirit/soul?

• The principle applies: 'That which was not assumed was not saved.' God wants to save the human intellect and will — they are precious, not dispensable. He assumes them so He might redeem them. This is why the intellect and will of Christ matter: He heals what He assumes.

• Condemned: At the First Council of Constantinople (381 AD).

D. Denial of Real Union

1. Nestorianism

• Founder: Nestorius, Patriarch of Constantinople. The heresy came to a head publicly at his Christmas homily of 428 AD — Christmas, of all times.

• Core claim: Nestorius denied that Mary could be called Theotokos (God-bearer / Mother of God). He said she could only be called Christokos (Mother of Christ / Mother of the human person of Jesus). His argument: God cannot be born.

• The real error: He was denying the real, substantial union of the two natures. He effectively posited TWO persons in Christ — a divine person and a human person — operating together but not truly united.

• The Communication of Idioms (communicatio idiomatum): The Church's refutation. Because the divine and human natures are substantially united in ONE person, whatever you predicate of Jesus in His human nature can be predicated of God. Examples:

◦ 'Jesus died' → 'God died' (through the humanity, in the hypostatic union). This is legitimate.

◦ 'God suffered' is a legitimate statement — not that the divine nature suffered, but that the divine person who fully possesses both natures suffered in His human nature.

◦ 'Mary is the Mother of God' is legitimate — she is the mother of the one divine person, Jesus Christ, even though God as God cannot be born. The birth is through the human nature which is really united to the divine person.

• Scriptural refutation: Luke 1:43 — Elizabeth, filled with the Holy Spirit at the Visitation, cries out: 'How is it that the MOTHER OF MY LORD should come to me?' — Scripture itself uses the title.

• Nestorius later made it explicit: two persons. The problems cascade: two persons would imply something like spiritual schizophrenia or a parasitic relationship. It unravels the entire doctrine of salvation.

• Condemned: Council of Ephesus (431 AD) — which also dogmatically defined Mary as Theotokos.

2. Monophysitism

• Name: From Greek monos (one) + physis (nature). Mono-physite = one-nature-ite.

• Core claim: In the Incarnation, the divine nature so overwhelms and absorbs the human nature that the human nature ceases to be truly human — it becomes divine. The result is one nature, not two.

• Important distinction: This is NOT the same as divinization (theosis). In divinization, the human nature is elevated and transformed by grace while REMAINING human. In Monophysitism, the human nature dissolves into the divine — it is not preserved.

• Why this matters: Even in heaven, in the beatific vision, I remain human. I do not become a third kind of thing. My humanity has 'ports' designed to plug into the divine life — but I am still a creature, still human, still distinct from God.

• Historical consequence: This dispute led to a schism at the Council of Chalcedon (451 AD). The Egyptian (Coptic) and Syrian churches walked out, believing their understanding of divinization was being misunderstood as Monophysitism.

• 1973 reconciliation: Pope Paul VI and Coptic Pope Shenouda III signed a joint declaration acknowledging that in fact both sides had been teaching the same truth all along — they had simply not understood each other properly. The Coptic schism was essentially a misunderstanding, not a true doctrinal disagreement. (Issues of jurisdiction — the Coptic churches appointed their own pope — remain.)

• In Egypt today: If you encounter a church and aren't sure if it's Coptic Catholic (in communion with Rome) or Coptic Orthodox (separated), simply ask: 'Who is your pope?' They will tell you gladly.

• Condemned: Council of Chalcedon (451 AD) — which produced the definitive 'without confusion, change, division, or separation' formula.

3. Monothelitism — An Offshoot of Monophysitism

• Name: Mono (one) + thelema (will). One-will-ism.

• Core claim: Although Christ has two natures, He has only ONE will — the divine will. His human will was dissolved into or absorbed by the divine will.

• Condemned: Third Council of Constantinople (681 AD).

• The truth — a real duality of wills with a real moral unity: Because Christ has two complete natures (divine and human), and each nature includes intellect and will, He necessarily has BOTH a human will AND a divine will.

• The relationship between the two wills:

◦ Christ's human will, in the most perfect fashion, is in harmony with the divine will — there is no conflict or opposition.

◦ The human will freely subordinates itself to the divine will. This subordination is not compelled — it is the most perfect expression of human freedom: a holy, fully-integrated human will that perfectly aligns with God.

◦ Because He is a divine person, He CANNOT SIN — not because His human will is suppressed, but because the person acting through the human nature is God, and God cannot be the subject of sin.

◦ His human will is truly free — He has real freedom of action. What He does NOT have is the freedom of contrariety — the freedom to choose between good and evil. A perfected humanity does not require the ability to choose evil any more than a person in heaven, who is perfectly free, requires the ability to sin.

• Scriptural testimony of two wills:

◦ John 6:38: 'I came down from heaven not to do MY will, but the will of Him who sent me.' — In the one God there is only one divine will; therefore this refers to His distinct human will.

◦ Matthew 26:39: 'Father, if it is possible, let this chalice pass from me; yet not my will, but yours be done.' — The agony in the garden: two distinct wills, in perfect moral harmony.

• The Agony in the Garden — St. Thomas Aquinas' explanation: In His sensitive appetite (his passions, the 'will of the body'), Christ had the perfectly natural, good human response of dreading the suffering He knew was coming. Any good human person who sees impending evil approaching will recoil — that is right and holy. This is not the human rational will in conflict with the divine will; it is the body's natural, appropriate response to anticipated torture. His rational will — the place of deliberate choice — then says: 'Yet not my will, but yours be done,' demonstrating that even in the face of suffering, the holy person does what God commands. The two wills are not in conflict — they are in perfect, free harmony.

IV. THE KNOWLEDGE OF CHRIST (CCC 474)

A. The Problem Passage

• Matthew 24:36 — 'But of that day or that hour no one knows, not even the angels in heaven, nor the Son, but only the Father.' (On the timing of the Second Coming.)

• The firm guardrail: It is CERTAIN that Jesus is not ignorant or in error about the day of judgment. He is God. He cannot get this wrong. Some Modernists claim He was simply mistaken — this is condemned (Second Council of Constantinople, Pope Vigilius).

B. What Is Certain

• Pius XII, Mystici Corporis (1943): 'Christ beheld the beatific vision in His human intellect from the moment of its conception.' — He always had full beatific knowledge in His human intellect. He knew He was God from the first moment of His existence as a human. The 12-year-old in the temple ('I must be about my Father's business') demonstrates this. His human intellect always had access to the fullness of divine truth.

• Therefore: He was not ignorant of the day of judgment. He had the beatific vision — full knowledge of God — from conception onward in His human intellect.

C. Possible Interpretations of Matthew 24:36

◦ He was not at liberty to reveal it: His human intellect had access to the knowledge, but it was not His to disclose. A possible reading.

◦ Marital idiom (Tim Gray): In Jewish marriage custom, the groom returns to his father's house to prepare the bridal chamber; the FATHER decides when the room is ready and sends the son back. Jesus may be using this idiom: 'the Father decides when I come back' — not a statement of ignorance, but of marital relationship and protocol. This fits the bridegroom/bride imagery of the Kingdom.

◦ Referring to His human knowledge in its experiential mode: Luke 2:52 — 'He grew in wisdom and stature and favor with God and men.' His human intellect grew in experiential knowledge (learning through experience), even while possessing beatific knowledge. In His experiential human knowledge, He may not have had this datum 'accessed' — but this is in the realm of free theological opinion, not defined doctrine.

D. The Theandric Quality and Activity of Christ

• Theandric (from Greek theos + aner = God + man): Referring to those acts of Christ where the human and divine natures cooperate so intimately that it is impossible to clearly separate which is acting.

• When Jesus walks on water — is that His divine nature working through His body, or is it His perfected human nature cooperating with supernatural grace? (Peter also walks on water — is Peter's cooperation a restoration of pre-fall human powers?) The Church has not definitively answered the mechanism.

• The divine nature does not swamp the human nature — it dances with it, penetrates it (like perichoresis between divine persons), so that the human nature is elevated and enlivened without being dissolved.

• It is legitimate to ask about each act: 'Is He acting in His human nature or His divine nature?' — but the substantial union means these are always the acts of the one divine person, never separated.

• Result: We cannot always cleanly separate what Jesus does as God from what He does as man — and that is by design, because He is the one hypostatic union. This is why He is the perfect mediator and high priest.

V. IMPLICATIONS OF THE HYPOSTATIC UNION

A. The Hypostatic Union Is Permanent

• The hypostatic union began at the moment of conception in Mary's womb. It has never been disrupted and will never be disrupted.

• Right now, seated at the right hand of God the Father, there is a human body with a human heart and a human soul — the body of Jesus Christ.

• The Incarnation is permanent: the God-Man exists forever. At the Second Coming and the consummation of all things, Christ will NOT shed His humanity. He will always be the Incarnate One, wedded in hypostatic union to human nature forever.

• This is why the Creed added: 'and His kingdom will have no end' — His kingship as the full, embodied human-divine person endures forever.

• Does the Incarnation represent a 'sacrifice' or 'diminishment' for God? No. God does not change — the perfection of human nature was already within God's creative conception, so 'taking on' human nature involves no real change from God's perspective. He is not diminished.

B. Sacred Art Can Depict Jesus (vs. Iconoclasm and Islam)

• Because Christ truly took on human flesh — real, visible, material humanity — He can be depicted in art. He had a real face, a real body, a real human presence.

• Icons, statues, sacred images are legitimate precisely because of the Incarnation. God loved matter enough to take it on — matter is good. Sacred art reflects this incarnational dignity of the material.

• Iconoclasm (8th-9th century): The heresy that destroyed sacred images, arguing they were idolatry. The Church condemned this — the Incarnation grounds the legitimacy of depicting Christ. We are not worshiping the material image; we venerate through it the person it depicts.

• Islam: Forbids all images of God and human beings in religious contexts — rooted in a very high transcendence of God that excludes Incarnation. This is the logical consequence of denying the Incarnation.

C. The Sacramental Regime Has Its Foundation in the Hypostatic Union

• God communicates through matter because that is how we learn — through our senses, through the physical world. This is how He made us. The Incarnation consecrates this principle.

• The seven sacraments use physical, material elements (water, oil, bread, wine, the touch of a hand) because God himself used matter to save us. The material is not incidental — it is essential.

• Protestant rejection of sacramentality is implicitly docetistic: it treats the material world as unimportant to salvation, as if God only works spiritually. But God took on flesh. Flesh matters.

• 'Objectively, Christ won everything on the cross. Subjectively, we must appropriate those graces — and the means He has ordained for that appropriation is sensible, material, accessible, and intimate.' The sacraments are that means.

D. The Church Is Both Divine and Human — Consistent With the Hypostatic Union

• The Church appears to some as merely a human institution — full of sinners, with a compromised hierarchy, with a very mundane face. This is scandalizing to many.

• But in light of the hypostatic union, the Church's dual nature — holy AND sinful, divine AND human, visible AND invisible — makes profound sense. Just as Christ is both fully divine and fully human in one person, the Church as His Body shares in that dual character.

• The institutionality, the visibility, the hierarchy, the physicality of the Church are not embarrassing concessions to human weakness — they are expressions of the incarnational principle. God works through human instruments, physical structures, and visible reality because that is the sacramental, incarnational way.

E. 'That Which Was Not Assumed Is Not Saved' — The Principle

• St. Gregory of Nazianzus. This is possibly the single most important phrase in Christology for pastoral and theological purposes.

• If Christ did not assume something, that thing is not redeemed. Conversely, everything He did assume is redeemed.

• What He assumed: A complete human nature — body AND soul, including human intellect AND human will. Therefore ALL of these are redeemed.

• Pastoral applications:

◦ The body is good and is redeemed — not a prison, not evil. Our bodies will be resurrected. Treat them accordingly.

◦ The human intellect is redeemed — we are called to know the faith, to think clearly, to study theology. Fideism (faith without reason) is not what God intends.

◦ The human will is redeemed — we are not doomed to sin. Sin is NOT definitional of human nature. 'Being human' does not mean 'sinning.' The more we are conformed to Christ, the more fully human we become. Sin is a wound, a cancer, an intrusion — it is not who we are.

◦ Concupiscence (the tendency toward sin after the fall) is a wound — not the definition of human nature. We are not compelled to sin. With grace, we can choose otherwise. God expects us to fight, not to settle.

QUICK REFERENCE: KEY TERMS, COUNCILS, SCRIPTURE, AND EXAM POINTS

Essential Definitions

• Christology: The theological study of who Jesus Christ is — His person, nature(s), and the mystery of the Incarnation.

• Hypostatic Union: The real, substantial union of the divine nature and human nature in the one divine person of Jesus Christ. Two natures, one divine person, without confusion, change, division, or separation.

• Consubstantial (homoousios): Of the SAME substance — the Son is consubstantial with the Father (defined at Nicaea 325). Not 'of like substance' (homoiousios — Semi-Arianism).

• Communication of Idioms: Because the two natures are united in one person, what is predicated of the human nature can be attributed to the divine person. 'God died.' 'Mary is the Mother of God.' These are legitimate statements.

• Theotokos: Greek: 'God-bearer' / 'Mother of God.' Mary is the Theotokos because she is the mother of the one divine person Jesus Christ. Defined at the Council of Ephesus (431 AD) against Nestorianism.

• Theandric: Pertaining to the God-Man — acts of Christ in which the human and divine natures cooperate so intimately they cannot be cleanly separated.

• That which was not assumed was not saved: Gregory of Nazianzus. Christ must assume the full human nature — body, soul, intellect, will — for the full human person to be redeemed.

• Adoptionism: Jesus was a man adopted/empowered by God — not inherently divine. A good description for us; heresy when applied to Christ.

• Docetism: Christ only appeared to be human (from dokeo = to appear). Matter is evil; God cannot truly take on flesh. Refuted by John 1:14, 1 John 4:2, 2 John 7.

• Arianism: The Son is the first and greatest created being — not truly God. Condemned at Nicaea 325 (St. Nicholas punched Arius).

• Apollinarianism: The divine intellect/will replaced the human soul in Christ — He had no human soul. Condemned at Constantinople I, 381.

• Nestorianism: Two persons in Christ (a divine and a human). Mary is only Christokos, not Theotokos. Condemned at Ephesus 431.

• Monophysitism: The human nature is absorbed into the divine — only one nature results. Condemned at Chalcedon 451.

• Monothelitism: Only one will in Christ (the divine). Condemned at Constantinople III, 681.

• Concupiscence: The disordered tendency toward sin that remains after the fall and after baptism. It is a wound, not part of our essential nature.

• Divinization (Theosis): The supernatural grace by which we participate in the divine life — without ceasing to be human. Our destiny. NOT the same as Monophysitism.

Key Councils and Dates

• Nicaea I (325 AD): Condemned Arianism. Defined Son as consubstantial (homoousios) with the Father. St. Nicholas punched Arius.

• Constantinople I (381 AD): Condemned Apollinarianism.

• Ephesus (431 AD): Condemned Nestorianism. Defined Mary as Theotokos (Mother of God).

• Chalcedon (451 AD): Condemned Monophysitism. Defined the hypostatic union: two natures in one person, without confusion, change, division, or separation. The Coptic/Syrian schism followed.

• Constantinople III (681 AD): Condemned Monothelitism. Defined two wills in Christ (human and divine), in perfect moral harmony.

• Nicaea II (787 AD): Condemned Iconoclasm. Affirmed the legitimacy of sacred images.

Key Scripture for Christology

• John 1:1 — 'In the beginning was the Word... and the Word was God.' (Divinity)

• John 1:14 — 'The Word was made flesh.' (Humanity — against Docetism)

• John 8:58 — 'Before Abraham was, I AM.' (Divinity)

• John 10:30 — 'I and the Father are one.' (Divinity)

• John 10:18 — 'I lay down my life and I take it back up.' (Divinity — against Adoptionism)

• Romans 1:3-4 — 'Descended from David according to the flesh, made Son of God in power...' (Misused by Adoptionists; properly read = real humanity + real divinity)

• Matthew 5:21-22 — 'You have heard it said... but I say to you...' (Christ as divine lawgiver)

• Matthew 12:8 — 'The Son of Man is Lord of the Sabbath.' (Divinity)

• Matthew 24:36 — 'Not even the Son, but only the Father' (re: the day of judgment — Church: He is not ignorant; interpretations vary on the mechanism)

• Matthew 26:38-39 — 'My soul is sorrowful... not my will, but yours' (human soul + two wills — against Apollinarianism and Monothelitism)

• Luke 1:43 — Elizabeth: 'Mother of my Lord' (Theotokos — against Nestorianism)

• Luke 2:52 — 'He grew in wisdom and stature' (human experiential knowledge)

• 1 John 4:2 — Every spirit acknowledging Christ come in the flesh belongs to God (against Docetism)

• 2 John 7 — Those who deny Christ came in the flesh are Anti-Christ (against Docetism — strongest condemnation)

Critical Exam Points

• Jesus Christ is a DIVINE person — NOT a human person. He is fully human but the person is the Second Person of the Trinity.

• Two natures: divine AND human. Each nature fully preserved. No confusion, change, division, separation.

• Two wills: divine AND human. Human will freely and perfectly subordinates itself to the divine will. He CANNOT sin — not because His human will is suppressed, but because the PERSON acting through the human will is God.

• He had the beatific vision in His human intellect from the moment of conception (Pius XII, Mystici Corporis, 1943). He always knew He was God.

• The hypostatic union is PERMANENT. There is a human body at the right hand of the Father right now and forever.

• 'That which was not assumed is not saved.' — Full human nature (body, soul, intellect, will) fully assumed = fully redeemed.

• Sin is NOT definitional of human nature. The more Christ-like we become, the more fully human we are.

• The Communication of Idioms: 'God died,' 'Mary is the Mother of God' — legitimate because of the substantial union of the two natures in one divine person.