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Objection 1: It seems that sacred doctrine is not one science; for
according to the Philosopher (Poster. i) "that science is one
which treats only of one class of subjects." But the creator and the
creature, both of whom are treated of in sacred doctrine, cannot be
grouped together under one class of subjects. Therefore sacred
doctrine is not one science.
Objection 2: Further, in sacred doctrine we treat of angels,
corporeal creatures and human morality. But these belong to separate
philosophical sciences. Therefore sacred doctrine cannot be one
science.
On the contrary, Holy Scripture speaks of it as one science:
"Wisdom gave him the knowledge of holy things" (Wis.
10:10).
I answer that, Sacred doctrine is one science. The unity of a
faculty or habit is to be gauged by its object, not indeed, in its
material aspect, but as regards the precise formality under which it is
an object. For example, man, ass, stone agree in the one precise
formality of being colored; and color is the formal object of sight.
Therefore, because Sacred Scripture considers things precisely under
the formality of being divinely revealed, whatever has been divinely
revealed possesses the one precise formality of the object of this
science; and therefore is included under sacred doctrine as under one
science.
Reply to Objection 1: Sacred doctrine does not treat of God and
creatures equally, but of God primarily, and of creatures only so far
as they are referable to God as their beginning or end. Hence the
unity of this science is not impaired.
Reply to Objection 2: Nothing prevents inferior faculties or habits
from being differentiated by something which falls under a higher
faculty or habit as well; because the higher faculty or habit regards
the object in its more universal formality, as the object of the
"common sense" is whatever affects the senses, including,
therefore, whatever is visible or audible. Hence the "common
sense," although one faculty, extends to all the objects of the five
senses. Similarly, objects which are the subject-matter of different
philosophical sciences can yet be treated of by this one single sacred
science under one aspect precisely so far as they can be included in
revelation. So that in this way, sacred doctrine bears, as it were,
the stamp of the divine science which is one and simple, yet extends to
everything.
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