The premise is simple. Focus on one thing, the most important thing, and you will get amazing results. While I like the book and how it makes you think, I don't 100% agree with it. I can't get myself to apply my whole life to one thing, or my career focus to be one thing. Now, I do recognize that getting focused will help you to make tons more progress than going scatter shot on every new and shiny thing, but I still can't bring myself to only focus that much right now. I find that my interests vary too much.

What I can do though. Is break my interests up into their different parts and focus on the one thing in those areas that can get me the most results.