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.
Thinking about problems that are difficult to solve may make you anxious, but not thinking about them (and hence not dealing with them) should make you more anxious still. When a problem stems from your own lack of talent or skill, most people feel shame. Get over it. I cannot emphasize this enough: Acknowledging your weaknesses is not the same as surrendering to them. It's the first step toward overcoming them. The pains you are feeling are "growing pains" that will test your character and reward you as you push through them.