I think confidence comes from doing something well, working at it hard, and you build it up. It's not something you're born with. You have to build the confidence as you go along.

I am a historian. With the exception of being a wife and mother, it is who I am. And there is nothing I take more seriously.

As a historian, what I trust is my ability to take a mass of information and tell a story shaped around it.

What I learned, more than anything, was that you can't have it all balanced perfectly at any one time. When I was young, it was much more balanced toward work. When I had my children, it was much more balanced toward love and family, and I didn't get a lot of work done. So you can't ask of it to be perfectly balanced at any time, but your hope is, before you die, you've somehow had each of those spheres come to life. That's probably more important than success in any one of those spheres alone.

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.

I think the most important thing I wanted to say at various times to Franklin and Eleanor Roosevelt was that it seemed so sad to me that - I really believe they loved each other and had a great deal of affection - but because of that early hurt in their marriage, there was a certain kind of distance from then on, until their deaths actually. So at times, I just wanted to push them together and say, "Come on, you guys! I know you love each other. This is crazy!"

You can be enormously effective for a period of time, because it's almost like there's an engine in you that needs to keep going, and you have a greater drive than other people - who may be more happy and balanced in life - because you have to keep going out and proving yourself over and over again.