Downturns are the best time to start businesses because you develop discipline that's very lean and mean in terms of how to spend money. And those habits serve you very well in good times.

I think a book is your calling card, your business card.

My worst fashion faux pas: probably orange shoes with white pants. I thought I looked spectacular.

If you want a friend, buy a dog.

You may lose your wife, you may lose your dog, your mother may hate you. None of those things matter. What matters is that you achieve success and become free. Then you can do whatever you like.

We need physical exercise to prepare our brain for long periods of concentration

Protecting Americans from harm goes beyond police and national defense. It's imperative that we not destroy the commons, the physical environment on which we rely.