I've been an athlete all my life. I was a competitive figure skater, and then when I realized skating was not an adult sport I took up tennis and played that quite seriously from the time I was about 18.

Ultimately, we didn't go to Germany to create a democracy. We went to overthrow Adolf Hitler. But once a democracy was there, Germany was a much bigger supporter of and help to our national interests, both economic and security than had ever been before.

I think the Saudis are not only not supporting terrorism, they're fighting it. And why? Because it is in their interests to fight it. We don't agree on everything, but I do believe that the Saudis for their benefit, they're fighting terrorism and fighting it quite aggressively.

I'm a strong believer that you have to have an equal opportunity to fail and to try things that are hard. I always tell my students, "Don't just take things that are easy for you. If you're really good at math, don't take just math. Take classes that make you write. If you're a really great writer, but bad at math, take math and make yourself work your way through it."

I think it's very humble to believe that there is no man, woman or child who should live in tyranny. That people who say, well, maybe Arabs just aren't ready for democracy or maybe Africans just are going to have corrupt governments, that seems to me arrogant.

Everywhere that I go in the world, people desperately look to American leadership in all of their world's most difficult problems. You can look at any region of the world and the United States is still the country to which those regions look for leadership.

What the United States has done hasn't always been liked or popular. But if you look at some of the most populous places in the world - China, India - the United States is not only respected but, in fact, popular.