You posted: That’s why “All scripture is given by inspiration of God and is profitable ... “ !
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A great verse, but what was “scripture” at the time it was written?
Come with me now, as we enter the time of yesteryear ...
A man ... preaching around the countryside, finds himself writing (a?) letter and realizes ... perhaps knows ... he's "under the influence" so to speak .. of God.
Is he thinking, listening or autowriting ?
Is he analyzing what he's doing?
I think mostly he is talking to the people he's writing to via quill and ink.
He's preaching .... he's just not in the presence of the people he's writing (preaching) to.
There was no "Bible" at the time thus there were no "scriptures" ... the commonly used word for the words of the Bible.