Jaltus,
Thank you for your last post. I too thought terminology was part of our disagreement.
Just fine tuning my explanation a little.
2 Timothy 3:16
16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
I look at this verse and and read thus: Scripture is profitable for doctrine. So if you quote a scripture and say it is your doctrine you fulfill this verse. If you modify the scriptures in the least, it is no longer scripture and no longer profitable. So necessarily , according to scripture, real doctrine is scripture. This is then the litmus test to judge doctrine by.
Reading the verse this way does not violate your grammatical understanding, which I don't understand. We do not use all of the scripture for our doctrine, therefore , doctrine is a part of scripture. But, we can use any part of it that we wish.