There are fixed rules in chess, and no one knows how the game will end.

Learning from our mistakes is critical for improving, but even I don't have patience for ranking my regrets. Regret is a negative emotion that inhibits the optimism required to take on new challenges. You risk living in an alternative universe, where if only you had done this or that differently, things would be better. That's a poor substitute for making your actual life better, or improving the lives of others. Regret briefly, analyze and understand, and then move on, improving the only life you have.

Nervous energy is the ammunition we take into any mental battle. If you don't have enough of it, your concentration will fade. If you have a surplus, the results will explode.

We've been saying Putin is a dictator for years who doesn't care about the law.

The technical phase can be boring because there is little opportunity for creavivity, for art. Boredom leads to complacency and mistakes.

Ratings are king and the money keeps flowing, and partisanship is so strong today that people rely on a few sources absolutely instead of thinking critically. So even being a cheerleader for a gameshow-host president with no respect for the rule of law or America's reputation in the world may not be a career-ending move.

Donald Trump envies anyone who can do things he can't.