Principles is Ray Dalio’s book on how to live life (i.e. his human operating system). Ray is the billionaire founder of Bridgewater Associates, the world’s largest hedge fund. What is interesting about this book is his emphasis on pain as a result of a radically honest view of one’s self and the extreme emphasis on self-reliance to impose a systematic approach to improving. Check it out, it’s sure to get you thinking about how you can be better.