Sound familiar? We deal with this DAILY here.
Compare the Bereans. They were not willing to accept what Paul said just because he said it. They would listen and consider, but would NOT concede, without real evidence from the Scriptures, that the TRUTH had been preached. Paul's Word MUST be subjected to God's WORD. True spiritual greatness.
You wrote:
“He REASONED WITH THEM OUT OF THE SCRIPTURES.”
Which means traditions. Not only is scripture some tradition written down, but it cannot be explained, interpretated without tradition. Also, since no New Testament yet existed, St. Paul had to relate oral stories (tradition) to explain how the Old Testament was fulfilled by Christ.