"That all our knowledge begins with experience, there is indeed no doubt....but although our knowledge originates WITH experience, it does not all arise OUT OF experience."

"Thus, be it understood, to demonstrate a theorem, it is neither necessary nor even advantageous to know what it means....[A] machine might be imagined where the assumptions were put in at one end, while the theorems came out at the other, like the legendary Chicago machine where the pigs go in alive and come out transformed into hams and sausages. No more than these machines need the mathematician know what he does."

"He who will not economize will have to agonize."

"Whoever in discussion adduces authority uses not intellect but memory."

"Poetry is the language in which man explores his own amazement."

"Poetry is to hold judgment on your soul."

"It is with words as with sunbeams. The more they are condenced, the deeper they burn."

"Adjectives are the potbelly of poetry."

"Confound those who have said our remarks before us."

"With just enough of learning to misquote."

"We gladly feast on those who would subdue us ... not just pretty words, Fester."

"A facility for quotation covers the absence of original thought."

"Whenever you fall, pick up something"

"Entia non sunt multiplicanda praeter necessitatem (Entities must not be multiplied beyond necessity.)"

"Theories should be as simple as possible, but not simpler."

"Tongue - a variety of meat, rarely served because it clearly crosses the line between a cut of beef and a piece of dead cow."

"An undefined problem has an infinite number of solutions."

"This coffee plunges into the stomach...the mind is aroused, and ideas pour forth like the battalions of the Grand Army on the field of battle.... Memories charge at full gallop...the light cavalry of comparisons deploys itself magnificently; the artillery of logic hurry in with their train of ammunition; flashes of wit pop up like sharp-shooters."