My thinking was theologically incorrect, and my words were borderline heresy. 

I have a Christian college degree after five years of intensive Biblical study. I have read through the Scriptures from cover to cover repeatedly. There is no lack of effort on my part to know God better. 

Then I read a book that pointed out an area where I was mistaken. I had misunderstood a couple of key passages and drawn some wrong conclusions. My theology was flawed. 

I have been studying the Bible for my entire adult life, and I was wrong. I am willing to admit that and grow from it. 

There is just so much for us to learn; even pastors need to understand God and his word more completely. So do you.