I would highly recommend the book Gichin Funakoshi: My way of life to anyone. It tells people a lot about what Karate or any martial art should be about. When I say this I mean like the way that you should conduct yourself in and outside of the dojo.
This book is about Gichin Funakoshi telling stories and things that had happened from his childhood up to the point of mastering the art of Karate. I learned many things from reading this book such as that no matter how disrespectful, mean or hurtful someone is you should always have respect for them. I also learned that persistence and determination are the keys to pushing past any obstacle that may stand in your way. This among other things is what I will take from this book and always remember.