Why did you write this book? I'm asked that question more than any other. And each time, the answer varies.
Rather than give you my many answers, here's how I cover it. "I wrote this book because I felt I had something to say." I don't add, "I believe readers can learn/grow from it." I hope they do, but that's not at the top of my list.
As selfish as this may sound, I write for me, and most of the books I write come from my own journey because of issues and problems I've faced and eventually overcome. Normally, I start the book while I'm still seeking resolution.
Instead of waiting until that "Ah ha! moment," I write the problem and each chapter contains the tiny steps I'm taking toward resolution. I don't say it that way, but I want to write in the heat of my pain and not afterward when I can say, "I've overcome; so can you."
I also assume that my problems aren't unique, but they're the kind of issues that most individuals face at one time or another. As it says in 1 Corinthians 10:13, our temptations (and problems) are common to humanity. Once I find peace, I'm ready to smooth out my writing and send it out.
I write out of my issues
as part of my method of solution.