I believed Afghanistan was always going to be hard. It's the fifth poorest country in the world. And when you fly over it, you realize that there's not much there. And, of course, it has the problem, too, of being on that border with Pakistan in basically an ungoverned region that has given the terrorists a staging ground. So it's a very difficult place. But I do believe that the mission there can succeed if success is defined as helping the Afghans to prevent the Taliban from being an existential threat to the Afghan government.

I use the word power broadly. Even more important than military and economic power is the power of ideas, the power of compassion, and the power of hope.

I think there are plenty of men out there who are capable and accomplished in their own realm. You don't have to be in the same field.

The quicker we get about the business of reducing our reliance on oil the better.

It is a dangerous thing to ask why someone else has been given more. It is humbling - and indeed healthy - to ask why you have been given so much.

I don't like anything that's "just an escape." To me the best part of golf is that, unlike my tennis game, I can actually get better. I've probably reached my plateau in tennis, but in golf I have a lot of room for improvement. I really enjoy working on my game. I like practicing. I chart my rounds.

Leading in a complex world means recognizing the simple things you can do to make things better.