I am long on ideas, but short on time. I expect to live to be only about a hundred.

An average American loves his family. If he has any love left over for some other person, he generally selects Mark Twain.

Never be discouraged, because every wrong turn attempt, when left behind you, is another step forward taking you closer to your goals.

Many of life's failures are people who did not realize how close they were to success when they gave up.

Sleep is like a drug. Take too much at a time and it makes you dopey. You lose time and opportunities.

None of my inventions came by accident. I see a worthwhile need to be met and I make trial after trial until it comes. What it boils down to is one per cent inspiration and ninety-nine per cent perspiration.

I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait until oil and coal run out before we tackle that.