America must always lead on the world stage. If we don't, no one else will. The military that you have joined is, and always will be, the backbone of that leadership. But U.S. military action cannot be the only - or even primary - component of our leadership in every instance. Just because we have the best hammer does not mean that every problem is a nail.

I didn't have a perfect model, but I wanted to try to blend my own personal reflections and experiences with this broader canvas to see how a lot of the narratives we have about economy and foreign policy got stuck. Because we have these categories of liberal, conservative, free marketer, open government - all these stereotypes about our politics and the categories we try to put things in are inadequate to this sort of complex, ambiguous, sometimes contradictory experience we have as ordinary people and that I have as an elected official.

I do have an obligation to make sure that I am following some of the rules. I can't simply ignore laws that are out there.

For me, Lincoln is like just a handful of people - a Gandhi, or a Picasso, or a Martin Luther King Jr. - who is an original and captures something essential.

Ultimately, peace is just not about politics. It's about attitudes; about a sense of empathy; about breaking down the divisions that we create for ourselves in our own minds and our own hearts that don't exist in any objective reality, but that we carry with us generation after generation. And I know, because America, we, too, have had to work hard over the decades, slowly, gradually, sometimes painfully, in fits and starts, to keep perfecting our union.

We reward people a lot for being rich, for being famous, for being cute, for being thin... one of the values I think we need to instill in our country, in our children, is a sense of 'usefulness', in other words, are we useful, are we making other peoples' lives a little bit better?

There was a time when if you had a financial crisis in Southeast Asia somewhere, it had no impact on our markets. Today it does.