When you are an historian, there's probably nothing that matters more than to be recognized by your colleagues in your own profession. I was lucky enough to win the Pulitzer Prize for History. I had to give a talk right after that to some young people. The most important thing to tell them, I think, is that you can't ever know that it's going to turn out that way.

Lincoln had internalized the pain of those around him-the wounded soldiers, the captured prisoners, the defeated Southerners. Little wonder that he was overwhelmed at times by a profound sadness that even his own resilient temperament could not dispel.

I still think about that one Jamiroquai video a lot.

Excitement about things became a habit, a part of my personality, and the expectation that I should enjoy new experiences often engendered the enjoyment itself.

I think after Sandy Hook, when Obama went out, and he talked a lot about gun control and met with the parents, there was a sense that something was going to happen. But then, I guess, the power of special interests was greater than public sentiment.

When I look at Franklin Roosevelt's leadership, I think the most important quality he had during the Depression and the war was this absolute confidence in himself, in his country, really in the American people. He was able to exude that confidence and almost project it.

Politicians generally form alliances and not friendships. Individuals and institutions achieve their ends through continual barter. But deals are not bonds. Indeed, intense emotional involvement with anything - with issues, ideology, a woman, even a family - can be a handicap, not only consuming valuable time, but more importantly, reducing flexibility and the capacity for detached calculation needed to take maximum advantage of continually changing circumstances.