t is not lawful to have various
contrary opinions of the notions. For Augustine says (De Trin. i, 3):
"No error is more dangerous than any as regards the Trinity": to which
mystery the notions assuredly belong. But contrary opinions must be in
some way erroneous. Therefore it is not right to have contrary
opinions of the notions.

Obj. 2: Further, the persons are known by the notions. But no
contrary opinion concerning the persons is to be tolerated. Therefore
neither can there be about the notions.

_On the contrary,_ The notions are not articles of faith. Therefore
different opinions of the notions are permissible.

_I answer that,_ Anything is of faith in two ways; directly, where any
truth comes to us principally as divinely taught, as the trinity and
unity of God, the Incarnation of the Son, and the like; and concerning
these truths a false opinion of itself involves heresy, especially if
it be held obstinately. A thing is of faith, indirectly, if the denial
of it involves as a consequence something against faith; as for
instance if anyone said that Samuel was not the son of Elcana, for it
follows that the divine Scripture would be false. Concerning such
things anyone may have a false opinion without danger of heresy,
before the matter has been considered or settled as involving
consequences against faith, and particularly if no obstinacy be shown;
whereas when it is manifest, and especially if the Church has decided
that consequences follow against faith, then the error cannot be free
from heresy. For this reason many things are now considered as
heretical which were formerly not so considered, as their consequences
are now more manifest.

So we must decide that anyone may entertain contrary opinions about
the notions, if he does not mean to uphold anything at variance with
faith. If, however, anyone should entertain a false opinion of the
notions, knowing or thinking that consequences against the faith would
follow, he would lapse into heresy.

By what has been said all the objections may be solved.
_______________________

QUESTION 33

OF THE PERSON OF THE FATHER
(In Four Articles)

We now consider the persons singly; and first, the Person of the
Father, concerning Whom there are four points of inquiry:

(1) Whether the Father is the Principle?

(2) Whether the person of the Father is properly signified by this
name "Father"?

(3) Whether "Father" in God is said personally before it is said
esse