y," cannot be
verified of any one of the _supposita_ of the divine nature. For the
Father is not the Trinity; nor is the Son; nor is the Holy Ghost. So
to say, "God is the Trinity," is false.
Obj. 2: Further, the lower is not predicated of the higher except
by accidental predication; as when I say, "animal is man"; for it is
accidental to animal to be man. But this name "God" as regards the
three persons is as a general term to inferior terms, as Damascene
says (De Fide Orth. iii, 4). Therefore it seems that the names of
the persons cannot be predicated of this name "God," except in an
accidental sense.
_On the contrary,_ Augustine says, in his sermon on Faith [*Serm. ii,
in coena Domini], "We believe that one God is one divinely named
Trinity."
_I answer that,_ As above explained (A. 5), although adjectival
terms, whether personal or notional, cannot be predicated of the
essence, nevertheless substantive terms can be so predicated, owing to
the real identity of essence and person. The divine essence is not
only really the same as one person, but it is really the same as the
three persons. Whence, one person, and two, and three, can be
predicated of the essence as if we were to say, "The essence is the
Father, and the Son, and the Holy Ghost." And because this word "God"
can of itself stand for the essence, as above explained (A. 4, ad 3),
hence, as it is true to say, "The essence is the three persons"; so
likewise it is true to say, "God is the three persons."
Reply Obj. 1: As above explained this term "man" can of itself stand
for person, whereas an adjunct is required for it to stand for the
universal human nature. So it is false to say, "Man is every man";
because it cannot be verified of any particular human subject. On the
contrary, this word "God" can of itself be taken for the divine
essence. So, although to say of any of the _supposita_ of the divine
nature, "God is the Trinity," is untrue, nevertheless it is true of
the divine essence. This was denied by Porretanus because he did not
take note of this distinction.
Reply Obj. 2: When we say, "God," or "the divine essence is the
Father," the predication is one of identity, and not of the lower in
regard to a higher species: because in God there is no universal and
singular. Hence, as this proposition, "The Father is God" is of
itself true, so this proposition "God is the Father" is true of
itself, and by no means accidentally.
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