If God is in you, He is working, and you are thus obligated to "work out your salvation with fear and trembling" (Phil. 2:12). Only those in heaven have salvation "in the bag." The rest of us are running a race for the finish line.
Paul was certainly running that race at one time. He was obviously living far above the sins he listed in 1 Corinthians 6:9-10 that mark one as being unrighteous and disqualified from inheriting God's kingdom. But did he think he had attained sinless perfection? No, it was something he was still pursuing even after he had been a believer for at least twenty-five years.
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