The conventional wisdom is often wrong. Crime didn't keep soaring in the 1990s, money alone doesn't win elections, and - surprise - drinking eight glasses of water a day has never actually been shown to do a thing for your health. Conventional wisdom is often shoddily formed and devilishly difficult to see through, but it can be done.

Once a musician has enough ability to get into a top music school, the thing that distinguishes one performer from another is how hard he or she works. That's it. And what's more, the people at the very top don't work just harder or even much harder than everyone else. They work much, much harder.

I don't want to be like the angry old guy in the corner who is always ranting and raving about the same things - but I don't mind doing that just a little bit!

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.

It's as if you were interested in fashion and your neighbor when you were growing up happened to be Giorgio Armani.

You can't concentrate on doing anything if you are thinking, “What's gonna happen if it doesn't go right?

People at CDC [Centers for Disease Control] who cut their teeth on diseases over the last 10 years have started to think of crime as another disease, and using some of these same concepts. It was something that was in the air in that world, but it was time to bust it out and apply it to any number of different social epidemics.