"I started this blog because my wife wanted me to stop telling her all my ideas, and this was a cheap way to communicate with all my friends in academia." (So did I!)From the interview of Matthew Kahn's, the urban and environmental economist (via Marginal Revolution).
"I think it's important to know what you don't know. When you know that you don't know something, the answer is to experiment!"
(BTW, he is married to Dora Costa, the brilliant economic historian.)