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.

I work very hard on the writing, writing and rewriting and trying to weed out the lumber.

People often ask me if I'm working on a book. That's not how I feel. I feel like I work in a book. It's like putting myself under a spell. And this spell, if you will, is so real to me that if I have to leave my work for a few days, I have to work myself back into the spell when I come back. It's almost like hypnosis.

Take the teacher not the course. Find out who the great professors are - the great teachers - and take their courses because a subject that you may not think you're interested in may turn out to be infinitely fascinating because of the way it's taught.

It would be the most crucial day of the entire war.

To me history ought to be a source of pleasure. It isn't just part of our civic responsibility. To me it's an enlargement of the experience of being alive, just the way literature or art or music is.

I love all sides of the work but that doesn't mean it isn't hard.