The person who failed often knows how to avoid future failures. The person who knows only success can be more oblivious to all the pitfalls.

No matter how bad things are, you can always make things worse.

The brick walls are there to stop the people who don't want it badly enough. They are there to stop the other people!

You may not want to hear it, but your critics are often the ones telling you they still love you and care about you, and want to make you better.

Are you a Tigger or an Eeyore?

The key question to keep asking is, Are you spending your time on the right things? Because time is all you have.

I was hugely impressed... was the ultimate example of a man who knew what he didn't know, was perfectly willing to admit it, and didn't want to leave until he understood. That's heroic to me. I wish every grad student had that attitude.