ement of the appetite
without indicating any excellence; whereas "understanding" denotes a
certain excellence of a knowledge that penetrates into the heart of
things. Hence the supernatural gift is called after the understanding
rather than after the will.
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SECOND ARTICLE [II-II, Q. 8, Art. 2]

Whether the Gift of Understanding Is Compatible with Faith?

Objection 1: It would seem that the gift of understanding is
incompatible with faith. For Augustine says (QQ. lxxxiii, qu. 15)
that "the thing which is understood is bounded by the comprehension
of him who understands it." But the thing which is believed is not
comprehended, according to the word of the Apostle to the Philippians
3:12: "Not as though I had already comprehended [Douay: 'attained'],
or were already perfect." Therefore it seems that faith and
understanding are incompatible in the same subject.

Obj. 2: Further, whatever is understood is seen by the understanding.
But faith is of things that appear not, as stated above (Q. 1, A.
4; Q. 4, A. 1). Therefore faith is incompatible with understanding
in the same subject.

Obj. 3: Further, understanding is more certain than science. But
science and faith are incompatible in the same subject, as stated
above (Q. 1, AA. 4, 5). Much less, therefore, can understanding
and faith be in the same subject.

_On the contrary,_ Gregory says (Moral. i, 15) that "understanding
enlightens the mind concerning the things it has heard." Now one who
has faith can be enlightened in his mind concerning what he has heard;
thus it is written (Luke 24:27, 32) that Our Lord opened the scriptures
to His disciples, that they might understand them. Therefore
understanding is compatible with faith.

_I answer that,_ We need to make a twofold distinction here: one on
the side of faith, the other on the part of understanding.

On the side of faith the distinction to be made is that certain
things, of themselves, come directly under faith, such as the mystery
to three Persons in one God, and the incarnation of God the Son;
whereas other things come under faith, through being subordinate, in
one way or another, to those just mentioned, for instance, all that
is contained in the Divine Scriptures.

On the part of understanding the distinction to be observed is that
there are two ways in which we may be said to understand. In one way,
we understand a thing perfectly, when we arrive at knowing the
essence of the