So why should your list of 66 books be considered “scripture”? That’s my point. There has to be an objective standard. It can’t just be, “use whichever books you like.
Now if you are arguing that it is self-evident that scripture is the 66 books, I want to hear why.
Werent’ all the books of the New Testament written by those who Christ personally chose? Then didn’t He tell them to wait for the Holy Spirit who would bring all to their remembrance. And do they not all agree with each other. Then the references to Old Testament works and do they not all agree with all the other 66 books? Seems good start to me.