When I got out of school, I spent two years just hitchhiking around. Every time I met some old farmer who could play banjo, I got him to teach me a lick or two. Little by little, I put it together.

Long live teachers of children, because they can show children how they can save the world.

My dad, the old professor, used to say, 'Never get into an argument about what's folk music and what isn't.'

John Adams and Thomas Jefferson corresponded for 13 years before they died on the same day. They asked, "How can one have prosperity without commerce? How can one have commerce without luxury? How can one have luxury without corruption? How can you have corruption without the end of the Republic?" And they really didn't know the answer.

I feel most spiritual when I'm out in the woods. I feel part of nature. Or looking up at the stars. [I used to say] I was an atheist. Now I say, it's all according to your definition of God. According to my definition of God, I'm not an atheist. Because I think God is everything. Whenever I open my eyes I'm looking at God.

I believe that all technological societies tend to self-destruct. The reason is that the very things that make us a successful technological society, such as our curiosity, our ambition and determination, will also cause us to fall.

The key to the future of the world is finding the optimistic stories and letting them be known.