faith, is also deemed impossible to be otherwise; and the reason why
science and faith cannot be about the same object and in the same
respect is because the object of science is something seen whereas
the object of faith is the unseen, as stated above.
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SIXTH ARTICLE [II-II, Q. 1, Art. 6]

Whether Those Things That Are of Faith Should Be Divided into Certain
Articles?

Objection 1: It would seem that those things that are of faith should
not be divided into certain articles. For all things contained in
Holy Writ are matters of faith. But these, by reason of their
multitude, cannot be reduced to a certain number. Therefore it seems
superfluous to distinguish certain articles of faith.

Obj. 2: Further, material differences can be multiplied indefinitely,
and therefore art should take no notice of them. Now the formal
aspect of the object of faith is one and indivisible, as stated above
(A. 1), viz. the First Truth, so that matters of faith cannot be
distinguished in respect of their formal object. Therefore no notice
should be taken of a material division of matters of faith into
articles.

Obj. 3: Further, it has been said by some [*Cf. William of Auxerre,
Summa Aurea] that "an article is an indivisible truth concerning God,
exacting [arctans] our belief." Now belief is a voluntary act, since,
as Augustine says (Tract. xxvi in Joan.), "no man believes against
his will." Therefore it seems that matters of faith should not be