“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.
You do understand that Paul was writing epistles when he wrote this ??.. so the writings he was talking about was the Old Testament,
and hold the traditions which ye have been taught] Hold is an emphatic word: stand firm and hold fast (Ellicott) gives the Greek sense more adequately. In traditions which you were taught there is no suggestion of the Romanist idea of Tradition, conceived as an authority distinct from the written Word of God; for the Apostle continues, whether by word or latter of ours (the pronoun belongs to both nouns). He bids them hold by what he had taught, whether it came through this channel or that, provided it were really from himself (comp. 2 Thessalonians 2:2, and ch. 2 Thessalonians 3:14; 2 Thessalonians 3:17). He is now beginning to communicate with the Churches by letter, and stamps his Epistles with the authority of his spoken word. The sentence asserts the claim of the true Apostolic teaching, as against any who would beguile the Church away from it. Comp. 1 Corinthians 11:2 : I praise you that in all things you remember us, and hold fast the traditions, even as I delivered them to you.(Cambridge Bible for Schools and Colleges)
BTW the quote you used is NOT 2 Thes 2:14 it is 2:15
So then, brothers and sisters, stand firm and hold fast to the teachings WE passed on to you, whether by word of mouth or by letter.
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.
The minute you change the words, you destroy the teaching the Lord provides...
It says nothing about doctrine...
2Th 2:15 Therefore, brethren, stand fast, and hold the traditions which ye have been taught, whether by word, or our epistle.
Paul says those traditions you have been taught...NOT any oral traditions someone may teach you in the future...
And of course you won't find the word Trinity in the scriptures...However, if non Catholics could not find the Trinity in the scriptures, non Catholics would not believe in the Trinity because the Trinity wouldn't exist...The Trinity is all over the scriptures...
Apparently the Catholic religion still can't find the Trinity in the scriptures...