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“One in three persons” is nowhere in scripture to be found!
It is an idea of men; men that consider themselves above the scriptures.
Let’s stick with the God that is revealed in scripture. “Christians” that can’t do that will not be likely to find his narrow path, as it is completely scripturally located.
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“Therefore, brethren, stand fast; and hold the traditions which you have learned, WHETHER BY WORD, **or** by our epistle.”
II Thess. 2:14
St. Paul gives equal weight to the doctrines taught “by word” which were not written down in his epistles. The doctrine of the Trinity is one of them.
Quotes are our friends.
Sometimes, though, they are our enemies.