"I don't think there is any such thing as an immortal soul. I think that the soul is just a function of the brain, and when the brain dies, the soul dies."

"I have not failed 10,000 times. I have successfully found 10,000 ways that will not work."

"I owe my success to the fact that I never had a clock in my workroom. Seventy-five of us worked twenty hours every day and slept only four hours — and thrived on it."

"Non-violence leads to the highest ethics, which is the goal of all evolution. Until we stop harming all other living beings, we are still savages."

"I could always invent something for which there was a demand."