Find something to do that you love because then the work itself is always the reward not the recompense. And if you love what you're doing you probably do better at it than doing something you don't love and therefore you'll be compensated appropriately.

History isn't just what happened, but what happened to whom and why and what would have been different if the cast of characters had been different.

I feel very strongly that history is about everything. It isn't just about politics or the military or social issues. If art, music, engineering, science, medicine, finance, the world of architecture and technology - if those are left out, then you're not getting a full sense of the human condition. History is human and we human beings are involved in all kinds of things and that's part of our humanity.

You can't love what you don't know much about. You can't convince, stimulate, hold the attention, teach, if you don't know what you're talking about.

I can fairly be called an amateur because I do what I do, in the original sense of the word - for love, because I love it. On the other hand, I think that those of us who make our living writing history can also be called true professionals.

I think it is one of the most extraordinary elections, a turning point for our country and for the world. That remarkable young man [Barack Obama] has kept his demeanor, kept his temperament and has shown a power to inspire. I see what energy that he has inspired among the young. Well, it inspires us old goats too.

There are innumerable writing problems in an extended work. One book took a little more than six years. You, the writer, change in six years. The life around you changes. Your family changes. They grow up. They move away. The world is changing. You're also learning more about the subject. By the time you're writing the last chapters of the book, you know much more than you did when you started at the beginning.