So I think, if September 11 taught us anything, it taught us that we're vulnerable, and vulnerable in ways that we didn't fully understand.

I'm actually genuinely optimistic about the United States and what's possible in the United States. And when you're out here, you see Americans across racial and economic and socioeconomic lines working together. And you maybe get a little bit less cynical than when you sit in the seat of kind of the epicenter of it all.

The moral case is, people say, "Oh they're not ready for democracy," but that's something someone who lives in a democracy would say about someone who doesn't live in a democracy. Well, if democracy is the highest form of human potential, then it can't be true for us and not for them. But, the practical case is democracies don't invade their neighbors. Democracies don't traffic in child soldiers. Democracies don't harbor terrorists as a state policy. So there's a reason to have more democratic states.

This system, built on free markets, free trade and free peoples and American protection, that's what got us from the end of World War II to the extraordinary events of the end of the Cold War and a system that was one of prosperity and peace for a lot of people, including for the United States.

Out of struggle very often comes victory.

Human beings are not perfect. Their institutions are not perfect, but they have to keep trying. And America has to help people keep trying.

Every life is worthy and every life is capable of greatness. We have an obligation to make sure that opportunity for greatness is there.