📖 Biblical Definition
Anhypostasia and enhypostasia are the paired technical terms by which the church guards the truth that the human nature of Christ, though real and complete, has no independent personhood of its own but subsists in the person of the eternal Son. Anhypostasia (“without person”) affirms the negative side: the human nature assumed by the Word never existed, and never exists, as a separate human person; there was no man Jesus who was first an individual and then taken up by God. Enhypostasia (“in-personed”) affirms the positive side: that same human nature is fully personal precisely because it subsists in the person of the Logos, who is its subject. Thus the one person of Christ is the eternal Son, who in the incarnation took into union with Himself a complete human nature—body and reasonable soul—so that there are two natures but one person, and that person is divine. The doctrine protects the church from two errors. Against Nestorianism, which effectively made two persons (a human and a divine) loosely conjoined, it insists there is but one person, the Son. Against the notion that the human nature is impersonal or incomplete, it affirms that the nature lacks nothing proper to humanity, being fully personalized in the Word. The man Christ Jesus is therefore truly and fully human, yet the “I” who speaks, suffers, and acts in that humanity is the eternal Son of God. This is why the deeds and sufferings of the human nature are rightly ascribed to the divine person—the Lord of glory was crucified—and why the incarnation is the Word made flesh, not the adoption of a pre-existing man.
📜 Webster 1828 Definition
Webster 1828 has no entry for these technical terms; they concern the PERSON of Christ—His human nature subsisting in the person of the divine Word.
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“Anhypostasia” (without independent person) and “enhypostasia” (subsisting in another’s person) are theological terms from the Greek hypostasis, person.
PERSON, n. — ...In the Godhead or in Christ, one of the subsistences; the human nature of Christ subsists in the person of the Son.
📖 Key Scripture
John 1:14 — "And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth."
Philippians 2:7 — "But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men."
Hebrews 2:14 — "Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same."
Luke 1:35 — "...therefore also that holy thing which shall be born of thee shall be called the Son of God."
⚠️ Modern Corruption
No major postmodern redefinition; these terms guard against ancient errors—Nestorianism, which splits Christ into two persons, and any adoptionism that makes a pre-existing man become the Son.
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The careful distinction of anhypostasia and enhypostasia exists precisely to fence the doctrine of Christ’s person against Nestorianism, the ancient error that so distinguished the two natures as to imply two persons—a human son and a divine Son—loosely joined in a moral or sympathetic union. Against this, the church confessed that there is but one person in Christ, the eternal Son, in whom the human nature subsists. The human nature is anhypostatic in that it has no personhood of its own apart from the Word, and enhypostatic in that it is fully personalized in Him. Deny this, and the unity of Christ dissolves into a partnership of two persons, and the saving acts of the God-man are torn apart.
The distinction also bars adoptionism and every modern Christology that begins from below with the man Jesus and then asks how He came to be divine or to be indwelt by God. If the human nature were a complete human person in its own right, then the incarnation would be the adoption or indwelling of a pre-existing man—not the Word becoming flesh, but the Word joining Himself to someone who already was. The doctrine insists on the opposite order: the eternal Son, who alone is the person, took into union with Himself at the moment of conception a human nature that never had and never has any independent existence. The man Christ Jesus is real, complete, and fully human, yet the subject of that humanity—the one who says ‘I’—is none other than the second person of the Trinity. So the incarnation is the personal act of God the Son, and the babe of Bethlehem is, in person, the Ancient of Days.
🔗 Greek & Hebrew Roots
The terms turn on hypostasis (person, subsistence): the human nature is an-hypostatic (without its own person) and en-hypostatic (in-personed in the Word, the Logos made sarx).
Usage
"By anhypostasia and enhypostasia, Christ’s human nature is complete yet has no person of its own, subsisting in the Son."
"The doctrine bars Nestorianism: there is one person in Christ, the eternal Word, not a human person joined to a divine one."
"Because the human nature is enhypostatic, the sufferings of the man are rightly ascribed to the divine person."