Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
I have found understanding how nature and evolution work helpful in a number of ways. Most importantly, it has helped me deal with my realities more effectively and make difficult choices. When I began to look at reality through the perspective of figuring out how it really works, instead of thinking things should be different, I realized that most everything that at first seemed "bad" to me--like rainy days, weaknesses, and even death--was because I held preconceived notions of what I personally wanted. With time, I learned that my initial reaction was because I hadn't put whatever I was reacting to in the context of the fact that reality is built to optimize for the whole rather than for me.