Most of the people who were responsible for 9/11 are now in custody or have been killed. But there are others, and they plot and they plan, and they hope to pull it off again. And while we have to be right 100 percent of the time, they only have to be right once. So there's no way to overreact to that.

We [USA] need to deal with our problems here at home if we're going to be strong enough to lead abroad.

Power is nothing unless you can turn it into influence.

We don't want the smoking gun to be a mushroom cloud.

I think that one of the greatest challenges we have today is around education. One of the things that is dividing us more and more is whether you have good prospects or you don't. Do you live a neighborhood where the schools are good? If you don't, your kids may not read until the time they're in third grade. Do you at least have access to a community college that will give you job training skills so that if you don't go for four years you will at least come out with a decent job and a decent wage. Too many people don't have that opportunity.

It is possible to work across the aisle in Washington, but it's hard. And I think it's been made worse by the kind of 24-hour news cycle, the fact that everything is on TV before you can work things out quietly. I think it's the intensity of information that makes it feel more difficult to get things done. But I didn't leave with a bitter taste about the politics. The one thing that I would say is, I do think there is an unfortunate tendency to turn political differences, or policy differences, into critiques of one another's character or motives, and that's unfortunate.

I think my father thought I might be president of the United States. I think he would've been satisfied with secretary of state. I'm a foreign policy person and to have a chance to serve my country as the nation's chief diplomat at a time of peril and consequence, that was enough.