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.
Introverts focus on the inner world and get their energy from ideas, memories, and experiences while extroverts are externally focused and get their energy from being with people. Introversion and extroversion are also linked to differences in communication styles. If you have a friend who loves to "talk out" ideas (and even has trouble thinking through something if there isn't someone around to work it through with), he or she is likely an extrovert. Introverts will usually find such conversations painful, preferring to think privately and share only after they've worked things out on their own. I've found that it is important to help each communicate in the way that they feel most comfortable. For example, introverts often prefer communicating in writing (such as email) rather than speaking in group settings and tend to be less open with their critical thoughts.