symbol is published by the authority of the universal Church.
Therefore it contains nothing defective.

_I answer that,_ As the Apostle says (Heb. 11:6), "he that cometh to
God, must believe that He is." Now a man cannot believe, unless the
truth be proposed to him that he may believe it. Hence the need for
the truth of faith to be collected together, so that it might the more
easily be proposed to all, lest anyone might stray from the truth
through ignorance of the faith. It is from its being a collection of
maxims of faith that the symbol [*The Greek _symballein_] takes its
name.

Reply Obj. 1: The truth of faith is contained in Holy Writ,
diffusely, under various modes of expression, and sometimes
obscurely, so that, in order to gather the truth of faith from Holy
Writ, one needs long study and practice, which are unattainable by
all those who require to know the truth of faith, many of whom have
no time for study, being busy with other affairs. And so it was
necessary to gather together a clear summary from the sayings of
Holy Writ, to be proposed to the belief of all. This indeed was no
addition to Holy Writ, but something taken from it.

Reply Obj. 2: The same doctrine of faith is taught in all the
symbols. Nevertheless, the people need more careful instruction about
the truth of faith, when errors arise, lest the faith of
simple-minded persons be corrupted by heretics. It was this that gave
rise to the necessity of formulating several symbols, which nowise
differ from one another, save that on account of the obstinacy of
heretics, one contains more explicitly what another contains
implicitly.