Question 21
How can the simple eternal Son become human and truly suffer?
The Son's humanity is personally his without becoming a constituent that completes or changes the divine nature.
In this question
The short answer
The eternal Son assumes a complete human nature and begins to live a genuinely human life. He does not turn the divine nature into humanity or combine them into a third nature. The one Person is both divine and human; his hunger, obedience, suffering, and death are truly his according to his humanity. The divine nature remains simple and impassible. This personal union is unique: it is neither ordinary creaturely dependence nor merely a sign through which an absent God is represented.
One subject two natures
The question is first who lives this human life. Christianity answers: the Son himself. His humanity is not a costume, a separate human person adopted by God, or a finite segment of deity. Chalcedon's confession holds together one personal subject and the abiding reality of divine and human natures. Council of Chalcedon, Definition of Faith.
Nature and person therefore cannot be counted as interchangeable units. Two natures need not entail two persons; one subject need not entail one nature. The Incarnation requires an account of assumption: a complete created human life subsists personally in the eternal Son. This names the relation without making its inner possibility transparent.
Created history belongs to the Son
There is real novelty. A human life begins, develops, acts, and suffers. Its subject is not merely related externally to the Son as a message is related to its sender. The Son lives it. Saying that divine nature gains no constituent protects simplicity, but the positive confession also identifies whose humanity this is. The union exceeds interpretation.
His human willing neither rivals the divine will nor disappears into it. Obedience has human actuality and cost. The Catechism therefore confesses two natural wills and operations in the one incarnate Person. Their distinction preserves his full humanity; their cooperation preserves the unity of his saving action. CCC 470–475.
Suffering belongs truly to the divine Son
The assertion that God suffered is true when God names the incarnate Son and suffering is attributed according to his human nature. It does not mean that suffering becomes an essential property of deity. Aquinas explicitly distinguishes the nature in which Christ suffers from the divine Person to whom the suffering belongs. Summa theologiae III, q.46, a.12.
This distinction prevents a false choice between a mutable divine substance and an untouched divine spectator beside a suffering man. The Son's solidarity is embodied. Yet its reality does not establish that every instance of suffering is necessary for goodness, or that God needs human pain to attain a fuller life. Redemption heals creatures; it does not repair a deficiency in God.
The paragraph receives Constantinople II's confession that Christ is one Person of the Trinity, while the following paragraphs preserve his full humanity and two natural wills.
Thus everything in Christ's human nature is to be attributed to his divine person as its proper subject, not only his miracles but also his sufferings and even his death:
The strongest objection
Does becoming human still introduce composition?
The incarnate Christ is truly acknowledged in two natures. What is denied is composition within the divine nature, as if humanity became a divine constituent or completed an imperfect deity. The union concerns the Son's personal subsistence in a created nature. This states the required distinction; a philosophical account of personal assumption remains an additional task, not something proved by the word relation.
What follows
- The one Person, two natures, two natural wills, and real Passion belong to Catholic Christology. Participation can clarify created dependence but cannot independently derive or replace the hypostatic union.
Sources
Connections
- Incarnation
The Son’s full humanity and two natural wills retain their own doctrinal warrants.