M. Scott Peck, The Road Less Traveled .
Life is difficult.
This book talks about how to deal with this. Peck is a therapist and the book has many illuminating and moving case studies. He talks about love, self-discipline, and spiritual growth. I started this book in mid-90s, and it didn't grab me. In November 1999 a chance conversation with a friend serendipitously led me again to the book, and this time I was in the right mental state for it, and it was a catalyst for major change.