The apostle Paul was a brave man (see Paul's First Missionary Journey, Paul's Second Missionary Journey and Paul's Third Missionary Journey), not only for the things that he did in his time, but for the things that he said, and wrote, for all time. Brave, and honest - to others, and to himself.
Almighty God is perfect. The Words of God are perfect. Jesus Christ is perfect. The Holy Bible is perfect. But, because humans are not perfect, our translations and understanding of all that was originally written is not perfect either. If it were, everyone with the Ears To Hear would completely agree with the full meaning of every verse. As it is, human reasoning, which is largely based upon our own personal experiences and situation, often makes up the shortfall, hence all of the different, and usually self-accommodating, interpretations and beliefs.
Despite having been given, through The Holy Spirit, to write so much of The Bible record, Paul knew full well that even his own understanding of God was, as he said, like seeing "in a mirror dimly" of all that there is to know and understand. If Paul himself did not fully understand what God was writing, through him, how could anybody, then or now, claim perfection?
Only God is perfect. Only God has the right to judge. And He will.
"Judge not, that you be not judged. For with the judgment you pronounce you will be judged, and the measure you give will be the measure you get." (Matthew 7:1-2 RSV)
There is nothing wrong with being convinced, in our own minds, that we are right about something. Nor is there anything wrong with teaching or vigorously debating those beliefs with fellow believers who are interested in doing so. But, there is a great amount wrong with judging, or condemning, or insulting, or persecuting other Christians who in good faith do not agree with the conclusions that we have freely and honestly reached in our own minds, because the conclusions that they have freely and honestly reached in their own minds just might be right. If it turns out in the end that the others were right, those who judged and condemned them now for "being so wrong" may later themselves be condemned, by Almighty God, at the sound of their own words:
Fact Finder: What is "truth"?