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.
The life that you will live is most simply the result of habits you develop. If you consistently use feelings of anger/frustration as cues to calm down, slow down, and approach the subject at hand thoughtfully, over time you'll experience negative emotions much less frequently and go directly to the openminded practices I just described.
Of course, this can be very hard for people to do in the moment because your "lower-level you" emotions are so powerful. The good news is that these "amygdala hijackings" don't last long so even if you're having trouble controlling yourself in the moment, you can also allow a little time to pass to give your higher-level you space to reflect in a quality way. Have others whom you respect help you too.