Here is Dante's beautiful and powerful credal statement in Paradiso, Canto 24 (lines 130-147).
And I respond: In one God I believe,
Sole and eterne, who moveth all the heavens
With love and with desire, himself unmoved;
And of such faith not only have I proofs
Physical and metaphysical, but gives them
Likewise the truth that from this place rains down
Through Moses, through the Prophets and the Psalms,
Through the Evangel, and through you, who wrote
After the fiery Spirit sanctified you;
In Persons three eterne believe, and these
One essence I believe, so one and trine
They bear conjunction both with sunt and est.
With the profound condition and divine
Which now I touch upon, doth stamp my mind
Ofttimes the doctrine evangelical.
This the beginning is, this is the spark
Which afterwards dilates to vivid flame,
And, like a star in heaven, is sparkling in me.
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