The longer we dwell on our misfortunes, the greater is their power to harm us.

Only crime and the criminal, it is true, confront us with the perplexity of radical evil; but only the hypocrite is really rotten to the core.

I'm not as famous as Stephen Hawking, but certainly in the U.S., I have a very high profile for a scientist. It is an awesome responsibility, one that I don't shoulder lightly.

I'm not looking for sympathy at all.

Do not be too moral. You may cheat yourself out of much life so.