Principles are concepts that can be applied over and over again in similar circumstances as distinct from narrow answers to specific questions. Every game has principles that successful players master to achieve winning results. So does life. Principles are ways of successfully dealing with the laws of nature or the laws of life. Those who understand more of them and understand them well know how to interact with the world more effectively than those who know fewer of them or know them less well.

I've learned that each mistake was probably a reflection of something that I was (or others were) doing wrong, so if I could figure out what that was, I could learn how to be more effective.

I found that whenever I encountered a situation, rather than just reacting to it, it was tremendously useful to think carefully about how I should react to it and other situations like it. Besides providing me with more thoughtful responses in each of these cases, approaching things this way provided me and others with guidance on how to deal with similar situations when they came up in the future.

More than anything else, what differentiates people who live up to their potential from those who don't is a willingness to look at themselves and others objectively

You have to put yourself in my shoes as a person who believes in radical truth and in being radically transparent, not in seeing things through somebody else's eyes.

The meaningful work and the meaningful relationships are, to me, comparable rewards. I think being on a mission to do something great is great, and to be on that mission with people who you have really meaningful relationships with not only provides both types of rewards, but it's mutually supportive. Because you can have tough love, but there's also the love part of that in terms of the caring for each other, and when you have the caring you can be tougher on each other. Some people describe it as an intellectual Navy Seals.

Since the only way you are going to find solutions to painful problems is by thinking deeply about them - i.e., reflecting - if you can develop a knee-jerk reaction to pain that is to reflect rather than to fight or flee, it will lead to your rapid learning/evolving.