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Similarly, Paul is referring to the Old Testament, not the Old and New Testaments, when he says, "from infancy you have known the Holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus. All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the servant of God may be thoroughly equipped for every good work." He couldn't be referring to the New Testament, since many NT books were yet to be written.

Is it within the realm of possibility that Paul had a little more insight on this topic when he wrote those words? Possibly knowing that what he was writing was Scripture and that the other books of the NT would be as well.

Peter referred to Paul's writings as "Scripture" so I would have to say that there was a unique respect given to those writings that were specifically given by the Holy Spirit. That, "Holy men of God spoke as they were carried along by the Holy Spirit.", is how they were described. It should be obvious that this designation and recognition was not given to just any writing - even IF it came from the pen of an Apostle. There was something intrinsic to them that believers were able to know they were the truth and should be obeyed. The Jews didn't wait until the entire Old Testament was written before they accepted the writings of Moses and the prophets.