"I don't think there's any substitute for a good idea."

"My success is due to the fact that I never went to school and was never forced to learn anything but what I wanted to know."

"I don't believe in the supernatural. I believe in nature, and I believe in science."

"I am not a scientist. I am an inventor."

"I am not a spiritualist, but I am a firm believer in the fact that we can communicate with the beyond."