Years of concentration solely on work and individual success meant that in his retirement [Lyndon Johnson] could find no solace in family, in recreation, in sports or in hobbies. It was almost as if the hole in his heart was so large that even the love of a family, without work, could not fill it.

I still think about that one Jamiroquai video a lot.

Whatever it is that you do, if you have that passion and desire for it, that's the most important thing.

What I think I've learned is that you're never going to get it all right, and you can't obsess about having a fact wrong or a date wrong or something like that, as long as you tried as best you could. If you've done the kind of research that you're sure is pretty good, then you just have to have confidence in it, so that nothing is perfect in life. I think that is what the criticism has helped me to understand.

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.

Many kids think unless they go to one of these great Ivy League schools, which I was lucky enough to go to later, that they won't get the same kind of learning. But I learned just the opposite lesson; that my best teachers were not at Harvard University.