A month before I turned in the book, he called me and asked me to take his name off the book. The reason came down to this: “I believe this now, but later I may change my thinking. If it's already out there in print, I can't unwrite it."
I tried to reason with him and point out that all serious writers change. That is, they grow. If they grow, they may not believe exactly as they did before or may change their position on something. I also pointed out that most people probably wouldn't remember anyway. It didn't matter. He was firm, so I removed his name.
Serious writers are growing writers.
We change our thinking, we mature, we learn as we live.