The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change by Stephen Covey
I owned this book for 15+ years and never read it, so I recently gave it away. And then I wanted to read it. I checked it out from the library and read it in three weeks because there was a hold on it, so I had to return it. Funny how a deadline changes things.
If you're interested in determining your path in life (well, as much as you can), working toward goals in all areas of your life, and having significant relationships with others, there's gonna be something for you in this book.