"Ability will never catch up with the demand for it."

"Keeping score of old scores and scars, getting even and one-upping, always make you less than you are."

"When in doubt, duck."

"Education's purpose is to replace an empty mind with an open one."

"It's so much easier to suggest solutions when you don't know too much about the problem."

"Too many people overvalue what they are, and undervalue what they are not."

"The only real training for leadership is leadership."

"Humility is the embarrassment you feel when you tell people how wonderful you are."

"[Jupiter's] satellites are invisible to the naked eye and therefore can have no influence on the Earth and therefore would be useless and therefore do not exist."

"I paint objects as I think them, not as I see them."

"Channeling is just bad ventriloquism. You use another voice, but people can see your lips moving."

"At the present rate of progress, it is almost impossible to imagine any technical feat that cannot be achieved - if it can be achieved at all - within the next few hundred years."