Living a Principled Life
Ray Dalio released his book Principles about the rules he has assembled for his personal life and his company. Living a principled life (and thinking in a principle way) is critical to living a life of fulfillment because it provides a foundation on which you can build. Your principles will be wrong at first. They are ever evolving, but without deciding on something you are unable to iterate on it and improve.
Below are my principles, even though they are still incomplete and ever evolving.