I think it's realistic to have hope. One can be a perverse idealist and say the easiest thing: 'I despair. The world's no good.' That's a perverse idealist. It's practical to hope, because the hope is for us to survive as a human species. That's very realistic.

Religion obviously played a role in this book and the previous book, too.

I always love to quote Albert Einstein because nobody dares contradict him.

With optimism, you look upon the sunny side of things. People say, 'Studs, you're an optimist.' I never said I was an optimist. I have hope because what's the alternative to hope? Despair? If you have despair, you might as well put your head in the oven.

Don't be an examiner, be the interested inquirer.

Think of what's stored in an 80- or a 90-year-old mind. Just marvel at it. You've got to get out this information, this knowledge, because you've got something to pass on. There'll be nobody like you ever again. Make the most of every molecule you've got as long as you've got a second to go.

I cannot even picture myself retiring. What would I do? I'll always be doing something, asking somebody questions, even if there weren't a book.