Figure out the hard thing first. Try to solve that as quickly as possible. Beware of false progress. - Annie Duke

Kill criteria could consist of information you learn that tells you the monkey isn't trainable or that you're not sufficiently likely to reach your goal, or signs that luck has gone against you.

（Daniel Gilbert）出版過一本著名的書《快樂為什麼不幸福？》（Stumbling on Happiness，

As Nietzsche points out, regret can do nothing to change what has already happened. We just wallow in remorse about something over which we no longer have any control. But if regret happened before a decision instead of after, the experience of regret might get us to change a choice likely to result in a bad outcome.