Apologetics · FaithLogic
Is the Incarnation Logically Coherent? — Omniscient Yet Ignorant, Immortal Yet Dead
The philosophical objection is sharp: God is all-knowing, all-powerful, everywhere-present, unchanging, and cannot die. Jesus asked questions, grew tired, did not know "the day or hour" (Mark 13:32), changed, suffered, and died. Nothing can be both F and not-F. So — the argument runs — the incarnation is a contradiction. The answer is the doctrine of the two natures, and it is more careful than the objection assumes.
One Person, Two Natures
The Chalcedonian Definition (451)
The Council of Chalcedon fixed the grammar: Jesus Christ is one person in two complete natures, divine and human, united "without confusion, without change, without division, without separation." The natures are not blended into a third thing, and they are not split into two people. There is one "who" — the eternal Son — and He now lives and acts through two "whats."
This dissolves the alleged contradiction. A contradiction is F and not-F in the same respect. "Christ is omniscient" (as to His divine nature) and "Christ increased in wisdom" (as to His human nature, Luke 2:52) are not the same respect — no more than "I am six feet tall" and "I weigh 170 pounds" contradict each other. Theologians call this the communication of properties: what is true of either nature is truly said of the one person, but grounded in the nature it belongs to.
This dissolves the alleged contradiction. A contradiction is F and not-F in the same respect. "Christ is omniscient" (as to His divine nature) and "Christ increased in wisdom" (as to His human nature, Luke 2:52) are not the same respect — no more than "I am six feet tall" and "I weigh 170 pounds" contradict each other. Theologians call this the communication of properties: what is true of either nature is truly said of the one person, but grounded in the nature it belongs to.
The Hard Cases
"He Did Not Know the Day or Hour"
The classical reading: the Son is omniscient in His deity, and in His genuine human mind He lived within the limits of human knowledge, not drawing on divine omniscience for information He had chosen not to access in that mode. Philippians 2:7 — He "emptied Himself" — is understood not as discarding a divine attribute but as veiling its independent exercise and taking "the form of a servant." (Some modern theologians argue for a stronger, voluntary self-limiting of the Son's knowledge during the earthly life; the mainstream view keeps the divine nature intact and locates the limitation in the human nature.)
"Who Held the Universe Together While Jesus Was an Infant — or Dead?"
The Son continued to sustain creation throughout the incarnation, according to His divine nature: "in Him all things hold together" (Colossians 1:17); He is "sustaining all things by His powerful word" (Hebrews 1:3) — stated of the incarnate Son. The divine nature is not shrunk to the size of the body. Theologians call this the extra: the Son is fully united to the humanity of Jesus and also fills and upholds all things. At the cross, death was the separation of Jesus' human body and soul; the divine person did not cease and the Trinity was not broken.
Could Jesus Have Sinned?
The historic answer is that He could not (He is impeccable), because sin is committed by a person, and the person of Christ is the divine Son, who cannot sin. Yet the temptations were fully real: His human nature genuinely felt their force and genuinely resisted — "tempted in every way, just as we are, yet He did not sin" (Hebrews 4:15); "because He Himself suffered when He was tempted, He is able to help those who are being tempted" (Hebrews 2:18). A bridge engineered never to fall is still truly load-tested; the reality of the test does not require the possibility of collapse.
"The Impassible God Cannot Suffer"
Classical theism holds that God is unchanging in His essence, will and character — not that He is inert. The incarnation is not a change in the divine nature; it is the divine person taking on a nature in which He can act and be acted upon. Cyril of Alexandria pressed the paradox against Nestorius: the impassible Word truly "suffered in the flesh." It is one person's suffering, undergone in and through the humanity He made His own.
💡 "The Incarnation Is Incoherent" — Complete Response"A contradiction is being F and not-F in the same respect. The two-natures doctrine (Chalcedon, 451) says Christ is one person in two complete natures. So 'omniscient as God' and 'grew in wisdom as man' are different respects — no contradiction, any more than 'six feet tall' and '170 pounds.' What is true of either nature is truly said of the one person. The Son kept sustaining the universe in His divine nature even while an infant or in death ('in Him all things hold together,' Colossians 1:17) — the divine nature is not shrunk to the body. His temptations were real without the possibility of sin, because the person tempted is the divine Son. And 'the impassible God cannot suffer' is answered as Cyril answered it: the Word suffered — in the flesh He made His own."
The objection assumes Christianity claims a single nature that is somehow both infinite and finite at once. It does not. It claims one person — the eternal Son — living through two complete natures, each keeping its own properties. Ignorance, growth, suffering and death are true of Him in His humanity; omniscience, immutability and upholding the cosmos are true of Him in His deity; and both are true of the one Christ. The doctrine was worked out precisely to keep the natures distinct and the person one, which is exactly what a coherent account requires.
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