a human nature united to Him, which does not belong to
His Divine Nature, it follows that the union took place in the Person
of the Word, and not in the nature.

Reply Obj. 1: Although in God Nature and Person are not really
distinct, yet they have distinct meanings, as was said above,
inasmuch as person signifies after the manner of something
subsisting. And because human nature is united to the Word, so that
the Word subsists in it, and not so that His Nature receives
therefrom any addition or change, it follows that the union of human
nature to the Word of God took place in the person, and not in the
nature.

Reply Obj. 2: Personality pertains of necessity to the dignity of a
thing, and to its perfection so far as it pertains to the dignity and
perfection of that thing to exist by itself (which is understood by
the word "person"). Now it is a greater dignity to exist in something
nobler than oneself than to exist by oneself. Hence the human nature
of Christ has a greater dignity than ours, from this very fact that
in us, being existent by itself, it has its own personality, but in
Christ it exists in the Person of the Word. Thus to perfect the
species belongs to the dignity of a form, yet the sensitive part in
man, on account of its union with the nobler form which perfects the
species, is more noble than in brutes, where it is itself the form
which perfects.

Reply Obj. 3: The Word of God "did not assume human nature in
general, but _in atomo_"--that is, in an individual--as Damascene
says (De Fide Orth. iii, 11) otherwise every man would be the Word of
God, even as Christ was. Yet we must bear in mind that not every
individual in the genus of substance, even in rational nature, is a
person, but that alone which exists by itself, and not that which
exists in some more perfect thing. Hence the hand of Socrates,
although it is a kind of individual, is not a person, because it does
not exist by itself, but in something more perfect, viz. in the
whole. And hence, too, this is signified by a "person" being defined
as "an individual substance," for the hand is not a complete
substance, but part of a substance. Therefore, although this human
nature is a kind of individual in the genus of substance, it has not
its own personality, because it does not exist separately, but in
something more perfect, viz. in the Person of the Word. Therefore the
union took place in the person.
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THIRD ARTICLE [II