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"The best measure of a man's honesty isn't his income tax return. It's the zero adjust on his bathroom scale."

"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."

"But the only way of discovering the limits of the possible is to venture a little way past them into the impossible."

"For every expert there is an equal and opposite expert."

"New ideas pass through three periods: - It can't be done. - It probably can be done, but it's not worth doing. - I knew it was a good idea all along!"

"If we have learned one thing from the history of invention and discovery, it is that, in the long run - and often in the short one - the most daring prophecies seem laughably conservative."

"Don't let it end like this. Tell them I said something."

"There is a tragic flaw in our precious Constitution, and I don't know what can be done to fix it. This is it: Only nut cases want to be president."

"Every silver lining has a touch of grey."

"Man is not like other animals in the ways that are really significant: Animals have instincts, we have taxes."

"Be humble for you are made of earth. Be noble for you are made of stars."

"Such laboured' nothings in so strange a style amaze the un-learned and make the learned smile."