ubsist not merely in the Divine, but also in the human nature.

Reply Obj. 1: Being is consequent upon nature, not as upon that which
has being, but as upon that whereby a thing is: whereas it is
consequent upon person or hypostasis, as upon that which has being.
Hence it has unity from the unity of hypostasis, rather than duality
from the duality of the nature.

Reply Obj. 2: The eternal being of the Son of God, which is the
Divine Nature, becomes the being of man, inasmuch as the human nature
is assumed by the Son of God to unity of Person.

Reply Obj. 3: As was said in the First Part (Q. 50, A. 2, ad 3; Q.
75, A. 5, ad 4), since the Divine Person is the same as the Nature,
there is no distinction in the Divine Persons between the being of
the Person and the being of the Nature, and, consequently, the three
Persons have only one being. But they would have a triple being if
the being of the Person were distinct in them from the being of the
Nature.

Reply Obj. 4: In Christ the soul gives being to the body, inasmuch as
it makes it actually animated, which is to give it the complement of
its nature and species. But if we consider the body perfected by the
soul, without the hypostasis having both--this whole, composed of
soul and body, as signified by the word "humanity," does not signify
_what is,_ but _whereby it is._ Hence being belongs to the subsisting
person, inasmuch as it has a relation to such a nature, and of this
relation the soul is the cause, inasmuch as it perfects human nature
by informing the body.
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QUESTION 18

OF CHRIST'S UNITY OF WILL
(In Six Articles)

We must now consider unity as regards the will; and under this head
there are six points of inquiry:

(1) Whether the Divine will and the human are distinct in Christ?

(2) Whether in Christ's human nature the will of sensuality is
distinct from the will of reason?

(3) Whether as regards the reason there were several wills in Christ?

(4) Whether there was free-will in Christ?

(5) Whether Christ's human will was always conformed to the Divine
will in the thing willed?

(6) Whether there was any contrariety of wills in Christ?
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FIRST ARTICLE [III, Q. 18, Art. 1]

Whether There Are Two Wills in Christ?

Objection 1: It would seem that in Christ there are not two wills,
one Divine, the other human. For the will is the first mover and
first commander in whoever wills. But in Christ the