You ask some good questions here and I see that some others have already attempted to answer them. I hope not to confuse things too much but will add my thoughts below.
But I would argue, what was Paul’s preaching based from? another words, what did he preach from. Remember who Paul was and where he came from. He himself, claims to have been a pharisee among pharisee’s. He was a student of Gamaliel, who stood up in the earlier chapters of acts. He would have been required to memorize the first five books of the bible. He knew those books and was familiar with all of them. Paul taught from those books. and argued from them.
so the argument on both sides in Acts 15 was born from the same place. Just 2 different positions or understandings.
It this is so, then I would ask you if
you, using only OT Scripture, could convincingly argue against requiring circumcision for the Gentiles? And, if you say that youcould make such an argument, would it be so convincing that it would overturn, in council, the clearly defined laws already written in those books that Paul had memorized? What passages of the OT would/could Paul use to argue that God’s eternal covenant of circumcision was overturned?
Now - fast forward to today…those who hold to the view of Sola Scriptura, generally will not accept anything that is not in the bible, and if something IS clearly written in the bible there is no arguing them out of it. The Bible of Paul’s time was the OT Scriptures. Circumcision was clearly called out. If the Early Church was SS, then the circumcision party wins hands down.
Yes, Paul used Scripture to argue and to preach from. He did so in order to show that Christ was who He claimed to be. The Son of the Living God. The Savior promised of Old.
The other thought is about what we call knew testament scripture.
How and when did those letter become authority. did they become authority only when they where put together in what we call today the bible? or where they being used before as authority.
As someone else already mentioned, wrtings would have authority when The Church recognized their authority. Initially this would be the local bishop. He would base his decision on what he knew of the origin of the writings and on whether he believed the writings to be true and orthodox to the Sacred deposit of faith handed to him by his predecessors and guided by the Holy Spirit.
As the Church spread, there came more writings, and more writings, Some widely accepted, some not so widely, but all claiming apostolic authority and all accepted by at least some of the bishops of The Church. Eventually there were 200 to 300 such writings.
Once the faith was legalized in the Roman empire, The Church had teh opportunity to really review these writings make determination for the universal Church as to which were fully authentic. These were compiled into the NT as clearly “God breathed” Scripture.
I should like to make a note here on this process that is often lost. The Church did not outright reject many of the texts that did not make it into the NT scripture. It was not a black and white decision. The 27 texts included were seen as completely True, but those excluded were not, and are not, seen as completely false. These writings contain and preserve some very interesting and widely held traditions of the Early Church and are studied even today by Scholars in The Church.
Lets translate that into todays world. by what authority do men like Jimmy Akin. Tim Staples, James Dobson, Billy Graham, preach, teach, & write books. Who gives them that authority, and where do they get the information they put into there books and speak on stage? Do that get that authority from the publisher, church, or the audience?
I’m not sure that I grant any of these people ANY authority in so far as governing what Christians believe. I do know that Mr’s Akin and Stapes, teach in accordance with the Magisterium of the Catholic Church, while Mr’s Dobson and Graham do not, relying more heavily on their own (Spirit guided?) interpretation of the Bible alone.
The letters of the new testament where meant to be written from authority, but did they ( the writers) expect their letters to be compiled into a book a couple of centuries later, be called a canon, and used to spread the gospel around the world? That I cannot say, but we do know those very letters where copied spread around and read over and over by the early church.
Yes they were copied and spread, along with many other writings that ultimately did not make it into the canon.
Frankly, I don’t think the writers expected there to be a need for such a compilation because most of them expected Chrsit to return sooner rather than later. Some of this expectation can be seen in the letters themselves.
Did the authority given those new testament letters ( that we call scripture today) actually come from the men who decided they should be canonized in 350AD or was the authority already given to them by the recipients of those letters because of who wrote them? Did everyone who read/ listened to those letters being spoken, except them as authoritative? probably not.
What really makes a book, letter, lecture, speech, thought, etc… authoritative?
just throwing out some thoughts and questions. not saying I have the answers.
The Question of Authority is complex. I don’t have all the answers either. I do know that Christ founded a Church, not a book. He gave Authority to that Church to bind and loose. He promised to be with and guide His Church into all Truth.
So ultimately, authority is transmitted from the Christ our King, through the Holy Spirit, to The Church which is all of us together as one and not each alone with a bible.
Peace
James