South Africa's increasingly, for example, the largest foreign investor in various other parts of Africa.

Peace, prosperity, and democracy cannot endure if imposed from the outside. We should cease to make false distinctions between peacekeeping and prevention; they are in fact inextricably linked.

Well, I think by any expectation South Africa has come a tremendously long way. We've seen a society that many people thought couldn't withstand a peaceful transition to democracy without a great deal of violence, in fact, make that transition and do it in relative peace and security.

I spend every day up at the United Nations where I have to interact with 192 other countries. I know how well the United States is viewed.

Can I be blunt? Yes. Can I be diplomatic? Yes. Can I concoct a mixture of vinegar and honey when the circumstances warrant? Yes.

I think it's very, very important that in foreign policy and national security decision making, as in any other realm, that there be a range of diversity that reflects the full complexity of America. We should draw on those experiences to inform our decision making.

President Obama is funny, he's thoughtful, he's challenging, he's fun to work with - and it's been an extraordinary privilege.