That's a last book for the year. It's very short and has a very clear message. The title says it all. I love it a lot. However I'm biased as my opinion is inline with the book.
I've discovered that the book splits people into two opposite sides. The question is simple, so I've found everybody have an answer for it. Do you think you should be the best in what you do? I would recommend this book, does not matter what your answer is. It's worth 1-2 hours reading.