Self-belief is one of those interesting components of how one thinks about oneself. I guess that people who have strong self-belief never really think about it. But for those of us who were raised to be humble, not too loud, and not to stand out, low self-belief is rooted very deep. In recent years I started to think about this when I saw that what you know doesn’t actually mean that much, and that just doing the work is not enough. When you see people who are less capable and less smart pass you on the right just because they...