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.
Mental pain often comes from being too attached to an idea when a person or an event comes along to challenge it. This is especially true when what is being pointed out to you involves a weakness on your part. This kind of mental pain is a clue that you are potentially wrong and that you need to think about the question in a quality way. To do this, first calm yourself down. This can be difficult: You will probably feel your amygdala kicking in through a tightening in your head, tension in your body, or an emerging sense of annoyance, anger, or irritability. Note these feelings when they arise in you. By being aware of such signals of closed-mindedness, you can use them as cues to control your behavior and guide yourself toward open-mindedness. Doing this regularly will strengthen your ability to keep your "higher-level you" in control. The more you do it, the stronger you will become.