The argument is:
Arguments against Dyophysites:
Premise 1) Ens and unum are strictly convertible; whatever is, is one, and whatever is one, is. Unity adds nothing positive to being, but is the privation of internal division
Premise 2) Numerical unity is that mode of unity which is both undivided in itself and divided from every other, only such unity is properly countable thus Scotus cites Aristotle:
“The One is undivided in itself and distinct from another”
Oxon. IV, dist. 6, q. 1, n.4
Premise 3) Whatever contains a substantial duality within itself is internally divided and thus lacks numerical unity, possessing only a diminished or formal unity
Conclusion 1) Therefore, the dyophysis thesis posits in Christ a duality of substantial natures
Conclusion 2) therefore, under that thesis, Christ cannot have numerical unity of beings, but is constituted as a duality of beings!
• Answering the Objection •
🔍 The Argument’s Fatal Equivocation: Nature vs. Person (Hypostasis)
The single most decisive error in the entire syllogism is this: the argument systematically conflates the unity of person (hypostasis) with the unity of nature (physis/essentia). Chalcedonian Dyophysitism has always been crystal clear on this distinction.
Theologically, the Hypostatic Union expresses the revealed truth that in Christ one person subsists in two natures, the Divine and the human. The numerical unity that Chalcedon asserts is the unity of the Person — the one hypostasis of the Eternal Word — not the unity of a single nature.
The Council of Chalcedon definitively established that in Christ the two natures, each retaining its own properties, are united in one subsistence and one person (eis hen prosopon kai mian hypostasin).
Therefore, when the argument asks “does Christ have numerical unity of beings?” — the Catholic answer is an unambiguous yes: there is one Being, one esse, one Person, the Divine Word. What is two is not the being or the person, but the natures through which that one Person subsists and acts.
❌ Attacking Premise 2: The Scotist Framework Turned Against the Argument
The argument borrows from Scotus on numerical unity — but ironically, Scotus himself provides tools that undermine this very argument.
Scotus argued that natures as common must have their own proper unity which is both real and less than the numerical unity of a singular; that is, natures are common prior to any act of the intellect and possess their own real, lesser unity.
This is decisive. For Scotus, natures do not, of themselves, possess numerical unity. Scotus distinguishes between numerical unity, which indicates singularity, and quiddative unity that allows for multiplicity among distinct natures. The nature as such — whether divine or human — has what Scotus calls quiddative or specific unity, not numerical unity. Numerical unity belongs to the suppositum (the individual subject, the person), not to the nature considered as such.
This means the argument proves too much: if having two natures implied a divided being, then the Trinity itself would be destroyed, since the Three Persons share one divine nature. The Persons are numerically three, yet the nature is one. Conversely, in Christ, the natures are two, yet the Person — the suppositum — is numerically one. The argument’s framework, rigorously applied, actually confirms Chalcedonian Christology rather than refuting it.
❌ Attacking Premise 3: The Suppositum Provides the Principle of Unity
The claim that “whatever contains a substantial duality is internally divided and lacks numerical unity” mistakes where unity is grounded in Christ. In classical Scholastic theology — Thomistic and Scotist alike — numerical unity is grounded in the suppositum (the person/hypostasis), not in the number of natures present.
Substantial unity — of things actu undivided and having one esse — refers firstly to substantial being; there can be no esse without it.
In Christ, the esse — the act of existence — is singular: it is the divine esse of the Eternal Son. The human nature of Christ has no independent esse of its own; it subsists in and through the Person of the Word. This is precisely the doctrine of enhypostasia: the human nature was “personalized” by the Son — it was not a mere appearance, but a genuine human nature that received its subsistence from the divine Person.
Because there is only one esse in Christ (the divine), Christ is numerically one being. The two natures are not two competing acts of existence; rather, the human nature is assumed into the one divine existence of the Son. Internal division of being would only follow if the two natures each had their own independent esse — which is exactly the Nestorian heresy, not the Chalcedonian position.
❌ Attacking Conclusion 2: Chalcedon Explicitly Rules Out Two Beings
The heart of the Chalcedonian definition reads: “in two natures, without mixture, change, division, or separation; the difference of natures not being removed by their union, but rather the propriety of each nature being preserved and concurring in one person and in one hypostasis, so that he is not divided or separated into two persons.”
The Athanasian Creed, binding on every Catholic, resolves the argument with sovereign clarity: “Although he is God and human, yet Christ is not two, but one. He is one, however, not by his divinity being turned into flesh, but by God’s taking humanity to himself.”
The conclusion that “Christ cannot have numerical unity of beings” simply restates Nestorianism, the heresy condemned at Ephesus (431 AD). Nestorianism explicitly delineated that Christ was literally two people — a divine person and a human person — who were referred to as one according to honor. Chalcedonian Dyophysitism was defined precisely in opposition to this, insisting on one Person, one hypostasis, one act of being.
🔑 Summary of the Refutation
Argument Step Error P1: Ens and unum are convertible True, but unity operates at the level of the suppositum/person, not the nature P2: Numerical unity = undivided in itself Correct, but natures do not bear numerical unity — persons/hypostases do P3: Dual natures = internal division = no numerical unity Equivocation — natures are formally two; the suppositum (Person) is numerically one C1: Dyophysitism posits a duality of substantial natures Conceded! — but this is about natures, not persons or esseC2: Therefore, Christ is a duality of beings Non sequitur — the unity of being belongs to the one hypostasis of the Word, not to natures
✝️ The Deeper Truth
The Council of Chalcedon defined Dyophysitism, asserting that Jesus Christ possesses two natures — divine and human — united in one person (hypostasis) “without confusion, without change, without division, without separation.” This formula was not a philosophical compromise — it was the precise articulation of who Jesus Christ is. Dyophysitism is not a theological novelty but a magisterial synthesis rooted in Apostolic Tradition.
The argument under examination ultimately succeeds only by refusing to make the foundational distinction between nature and person — the very distinction the entire Christological tradition, from the Cappadocians to Aquinas, developed to protect the truth of the Incarnation. Once that distinction is restored, the syllogism collapses entirely.
Then Christ is truly God-made-man — and He is — the Eternal Word, the Second Person of the Trinity, took on flesh not merely to display power, but to unite Himself permanently to human nature and draw all of humanity into divine life.
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