Article 3. Whether sacred doctrine is one science?
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 [scientiam] of
holy things” (
Wisdom 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, ***, 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.