"If the human brain were so simple that we could understand it, we would be so simple that we couldn't."

"Common sense is not so common."

"I can't tell you if genius is hereditary, because heaven has granted me no offspring."

"Genius is more often found in a cracked pot than in a whole one."

"I not only use all the brains that I have, but all that I can borrow."

"They are ill discoverers that think there is no land, when they can see nothing but sea."

"The man who has no imagination has no wings."

"Really we create nothing. We merely plagiarize nature."

"Imagination has brought mankind through the dark ages to its present state of civilization. Imagination led Columbus to discover America. Imagination led Franklin to discover electricity."

"The creative person is both more primitive and more cultivated, more destructive, a lot madder and a lot saner, than the average person."