“The first principle is that you must not fool yourself – and you are the easiest person to fool. So you have to be very careful about that.”

:Richard Feynman in Cargo Cult Science in Surely You’re Joking, Mr. Feynman.

I had once thought to take drugs, but I got kind of scared of that: I love to think, and I don’t want to screw up the machine.

:Richard Feynman in Altered States in Surely You’re Joking Mr. Feynman.

“If you see a dog walking on his hind legs, it’s not so much that he does it well, as that as he does it at all.”

:Richard Feynman quoting Samuel Johnson in Found Out In Paris in Surely You’re Joking, Mr. Feynman.

“The students had, for example, a special ceremony in which they granted each Nobel-Prize-winner the special “Order of the Frog.” When you get this little frog, you have to make a frog noise.

:Richard Feynman in Alfred Nobel’s Other Mistake in Surely You’re Joking, Mr. Feynman.

“There were a lot of fools at that conference – pompus fools – and pompous fools drive me up the wall. Ordinary foolks are all right; you can talk to them, and try to help them out. But pompus fools – guys who are fools and are covering it all over and impressing people as to how wonderful they are with all this hocus pocus – THAT, I CANNOT STAND! An ordinary fool isn’t a faker; an honest fool is all right. But a dishonest fool is terrible!”

:Richard Feynman in Is Electricity Fire? in Surely You’re Joking, Mr. Feynman.