When I look at what a writer owes to the reader, it's critical to know that everything you're writing about is not made up in your head. I feel that unless you can document and be certain about what it is that you're writing about, the reader is going to lose faith in your own integrity.

I think if I were reading to a grandchild, I might read Tolstoy's War and Peace. They would learn about Russia, they would learn about history, they would learn about human nature. They would learn about, "Can the individual make a difference or is it great forces?" Tolstoy is always battling with those large issues. Mostly, a whole world would come alive for them through that book.

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.

The past is not simply the past, but a prism through which the subject filters his own changing self-image.

He (William Howard Taft) had little patience with the unconscious arrogance of conscious wealth and financial success.

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.

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!"