I really can't reccommend any of the couple thousand books I've read in my life time.
As I read more and more books I began to notice that each book added less and less to the big picture.
To me there are great ideas but no great books. Great ideas are pervasive and can be found in various degrees in many books.
To appreciate a "great idea" you have to be ready for it.
The books I liked were the ones that put into words the ideas I was on the verge of expressing.
Big ideas?
Free will is impossible or at best unimportant.
Death got us to where we are.
Our brains are overated.
Nobody deserves credit or blame.
Language is a poor representation of the world.
Geography is important. National boundaries aren't.
You can't be or have a self without selfishness.
Science without vision is just a passtime.
Vision without science is blind.
Marriage is not made in heaven.
Eggs are expensive - sperm is cheap.
No one is at the controls any where. Not inside the person. Not over the universe.
All you need to know about a person is What they want and How they get what they want. What they avoid and how they avoid it.
Most important questions for communication. What do you mean? How do you know that?
I'm not trying to hijack the thread. But don't just mention books. What BIG IDEA did you get from the book.
To be fair many of you have also explained how books helped you.