Foreign policy is now a huge field. It isn't just people who are studying political science. There are so many aspects to it in terms of understanding hard science for people who are studying climate change, or people who are interested in health policy or food security, or people who care about education.

The greatest thrill in my life was to represent the United States of America.

I consider it my patriotic duty as an ordinary citizen - not as Secretary of State - to ask questions. I think we have to ask ourselves the tough questions.

What's the point of having this superb military you're always talking about if we can't use it?

Democracy cannot be built on revenge and you will not have the support of the world if you are intolerant and take the law into your own hands.

Leaders are made by the situations they are involved in. I think that some rise to the occasion and some do not.

US is a very religious country. Separation of church and state is part of our credo, but that it is hard to understand since our money says "In God we trust" and every President says "God bless America".