The people at the top don't work just harder or even much harder than everyone else. They work much, much harder.

Incompetence annoys me. Overconfidence terrifies me.

Lesson Number One: The Importance of Being Jewish

Giants are not what we think they are. The same qualities that appear to give them strength are often the sources of great weakness.

I should point out that I have a picture of Asbel Kiprop as the screensaver on my phone. Is that embarrassing?

Incompetence is certainty in the absence of expertise. Overconfidence is certainty in the presence of expertise.

The biggest mistake we make is trying to square the way we feel about something today with the way we felt about it yesterday. You shouldn’t even bother doing it. You should just figure out the way you feel today and if it happens to comply with what you thought before, fine. If it contradicts it, whatever. Life goes on.