"Opportunity is missed by most people because it is dressed in overalls and looks like work."

"If I find 10,000 ways something won't work, I haven't failed. I am not discouraged, because every wrong attempt discarded is another step forward."

"I never did a day's work in my life. It was all fun."

"The doctor of the future will give no medicine, but will educate his patients in the care of the human frame, in diet, and in the cause and prevention of disease."

"If we all did the things we are capable of doing, we would literally astound ourselves."

"To invent, you need a good imagination and a pile of junk."

"The prelude to Tristan and Isolde reminds me of the Italian painting of the martyr whose intestines are slowly being unwound from his body on a reel."

"The function of science fiction is not always to predict the future but sometimes to prevent it."

"The idea of legally establishing inalienable, inherent and sacred rights of the individual is not of political but religious origin."

"When the stomach is full, it is easy to talk of fasting."

"He who wrestles with us strengthens our nerves and sharpens our skill. Our antagonist is our helper."

"One of the most obvious facts about grownups to a child is that they have forgotten what it is like to be a child."