A few days ago I was chatting with a friend about the sense of insufficiency. He mentioned someone who has achieved a lot yet felt inadequate. I think we all feel this to some degree. I used to think mathematicians are the smartest people in the world so they must be so assured of themselves. But Terence Tao, winner of the Fields Medal, said mathematicians are humans too. “We feel like we don’t deserve to be doing math, and everyone else around us seems to be doing better than us. Because we always face problems we can’t solve, and sometimes, we wonder whether we have what it takes.”