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.
People's emotions tend to heat up when there is disagreement. Remain calm and analytical at all times; it is more difficult to shut down a logical exchange than an emotional one. Remember too that emotions can shade how people see reality. For example, people will sometimes say, "I feel like (something is true)" and proceed as though it's a fact, when other people may interpret the same situation differently. Ask them, "Is it true?" to ground the conversation in reality.