"I never had a bad break in my life. I have had a lot of hard ones, but never a bad one."

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

"I can hire half of the people in the country to do the thinking for me, but I can't hire people to be enthusiastic."

"I am not a spiritualist. I am not a medium. I am a scientist. I am trying to build a machine to communicate with the dead."

"The world is full of people who are always waiting for someone else to do something about their problems."