Paul gave his personal opinion as a spirit-filled apostle. His counsel, however, was “God-breathed” and so came to form part of the Sacred Scriptures, having equal authority with the rest of those Scriptures.
The Governing Body really stuck their foot into a huge pile of s*&t with their not very well thought out made-up doctrine in the Insight book. If Paul was "spirit-filled" and said he was giving his opinion, shouldn't we take him at his word? If he was saying that his thoughts were his own because there were no scriptures that he was basing them on, wouldn't he be going beyond what is written, thus making him a hypocrite for warning others about doing the same thing? If they were really God's thoughts but Paul was calling them his own "opinion," wouldn't he be taking credit for something that really belongs to God? If "all scripture is inspired by God," wouldn't Paul's statement that he was stating his opinion have been made under inspiration?
So basically the Governing Body is calling Paul a liar, while at the same time saying we should believe everything he writes. Wow! No wonder they are so clueless when it comes to understanding scripture. They've demonstrated that with their latest explanation of the faithful and discreet slave. They claim that God has been directing their understanding of the Bible, yet for more than 100 years they didn't even know that they exclusively are the faithful and discreet slave, if that new iteration can be believed. Just claiming that the Almighty is directing them makes their god seem so weak and impotent.