I read through this thread to catch up, planning to list that very book. In 1976 I was pleasing my wife by attending church with her instead of bass fishing on Sundays, and since I was a businessman was expected to take on leadership roles, the pastor ignoring my excuses and protests, paying a high price of neglecting my hobby. I wasn't even saved, knowing almost nothing about the Bible. Even so, I was put teaching high school Sunday School, mostly just reading the prepared lesson plans for So. Baptists. It would have been more appropriate for me to be a student. I was then asked to also lead the Training Union class at night. The group chose to study The Pilgrim's Progress, by Paul Bunyan, written over three centuries ago. We had a really old edition, hard to read, requiring a lot of study to lead. By the time we finished there were more people wanting to "rededicate" or be saved and be water baptized than the pastor could remember in all his years there.
I was awe struck. "Could the Bible actually have such a message in it? I was driven to read the Bible cover to cover. During that first pass through I discovered the answer is Yes. Within weeks I was standing at the pew, white knuckled hands clamped on the back of the pew in front of me, broke down and yielded to that knocking at my door, and was born again Jan 6, 1976.
There's now a free audio of it, easy to enjoy.