Losing the ability to get about.

I saw them recently on their morning walk, and they caused me a pang. I have always wanted a pug and now I can't have one, because buying a puppy when you are too old to take it for walks is unfair. There are dog-walkers, of course; but the best part of owning a dog is walking with it, enjoying its delight when it detects the signs that a walk is imminent, and its glee when its lead is unsnapped and it can bound off over the grass, casting cheerful looks back at you from time to time to make sure that you are still in touch.

Being alone and other people getting busier with families and life.

So far, getting older has made almost everything better.

Nobody has ever accused me of being a superior communicator. If I could have conveyed to the American people the concerns I had, and my heartbeat, a little more clearly, maybe I would not be unemployed and retired. And I might not be this happy, either. I learned a lot from Ronald Reagan about communication. Never got to be in his league in terms of it, but he could say something and the American people might not agree with the issue, but they could empathize with him.

If you really want to make a difference, whether it’s in helping other people, or whether it’s in fighting for your country, or whether it’s in the political arena, or journalism, or physics, you’ve got to persevere. You’ve got to understand that there are going to be some enormous bumps in the road.

Abraham Lincoln truly inspired me. It wasn't just the freeing of the slaves, he kept the Union together. Some people even forget that today. What I think inspired me was the fact that in spite of being the president of the United States he retained a certain down-to-earth quality. He never got to be a big shot, and he cared about people.

One of the historians here in Williamsburg talked about War and Peace. I had to read that in school. It was an inspiring, lengthy treatise. I read it twice. It taught me a lot about life. There was a marvelous book by Salinger called Catcher in the Rye. There was a book about discrimination called Gentleman's Agreement. These books I think helped shape my life. But to be honest with you, not one book stands out as the defining book for me.

It's family, and it's faith, and it's friends. I would tell them that. Don't forget that. In your brilliance, don't turn your back on your friends. Don't think you're entitled to something because you're smarter than the next guy.

If I were to give advice to young people, high-achieving young people for example, I'd have to say, don't neglect your family. Politics is important, sitting at the head table is glamorous. Traveling around the world, trying to do something for world peace was wonderful. But family and friends and faith are what really matter in life. And I know that. I see it so clearly now. And so, as they climb the ladder of achievement, I'd simply say, remember what Barbara Bush told those girls at Wellesley: "What happens in your house is more important than what happens in the White House." And it's true. It's so 100 percent true.