“[Lisp is the] greatest single programming language ever designed.”

“An approximate answer to the right problem is worth a good deal more than an exact answer to an approximate problem.”

“If you don't know how great this country is, I know someone who does; Russia.”

“There are three methods to gaining wisdom. The first is reflection, which is the highest. The second is limitation, which is the easiest. The third is experience, which is the bitterest.”

“How bitter a thing it is to look into happiness through another man's eyes!”

“All models are wrong, but some are useful.”