When we pray and ask for God's guidance He will make His word plain to us. I call the Bible the never ending story because the minute I have finished the book I start reading it again and I find things that I say to myself - I have read this book many times before and why didn't I get this then. .
I think that if we have error about the bible in our mind as truth we are not listening to the Holy Spirit but to doctrines made by men. Listening prayer always leads to our actions.
The action I was led to was study. I searched for where the ideas came from that disagreed with scripture. When did someone make the doctrine that our guide was not how the Lord told us to live but our guide was to to listen only to that works do not save us. They could not accept that scripture tells us to listen to both. Or the doctrine of following Jesus, not God, disregarding that Jesus said He and God had the same policies. For example. I knew God was truth, men weren't. So I felt I had to find out when and how it was that men made their interpretations into doctrines.
By digging into the most reliable history I could find I found that in 132 the Romans almost wiped out the Jewish race they killed so many. Before that the church was headed by men who knew scripture, then the gentiles took over. They were all men who lived and thought in a world without God, ones who now knew Christ but not scripture. They mixed in ideas from their heathen world with the word of God. Constantine made it law. Religion and government was still united. The church called "The Way" was wiped out, it disappeared by 500. It was the church established by the men who personally knew Christ, established by the ways of scripture.
There is only one truth and that truth is in scripture. The Pharisees did as we are today--they interpreted scripture and said their doctrines were the truth. Their doctrines made much of one truth and ignored the truths given that opposed their interpretations. They followed rabbis that were not created by God instead of the high priest.
Jesus is the fulfillment of the high priest, to follow Him is the same as following the Father. No scripture disagrees with ANY other scripture. The Lord did not divide His word, dividing it into old and new. Again, it was men who did that.