The atoms come into my brain, dance a dance, and then go out — there are always new atoms, but always doing the same dance, remembering what the dance was yesterday.

Quote in context:

“For instance, the scientific article may say, “The radioactive phosphorus content of the cerebrum of the rat decreases to one-half in a period of two weeks.” Now what does that mean? It means that the phosphorus that is in the brain of a rat — and also in mine, and yours — is not the same phosphorus as it was two weeks ago. It means the atoms that are in the brain are being replaced: the ones that were there before have gone away. So what is this mind of ours: what are these atoms with consciousness? Last week’s potatoes! They now can remember what was going on in my mind a year ago — a mind which has long ago been replaced. To note that the thing I call my individuality is only a pattern or dance, that is what it means when one discovers how long it takes for the atoms of the brain to be replaced by other atoms. The atoms come into my brain, dance a dance, and then go out — there are always new atoms, but always doing the same dance, remembering what the dance was yesterday.”

Richard Feynman, “The Value of Science” (speech at NAS meeting, 1955)
reprinted in The Pleasure of Finding Things Out: The Best Short
Works of Richard P. Feynman
 (Jeffrey Robbins, ed., 1999)

I don’t know anything, but I do know that everything is interesting if you go into it deeply enough.

Richard Feynman, from Omni interview, “The Smartest Man in the World”(chapter 9), The Pleasure of Finding Things Out (1999)

http://en.wikipedia.org/wiki/Richard_Feynman
http://en.wikiquote.org/wiki/Richard_Feynman

Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.

Richard Feynman. From lecture “What is and What Should be the Role of Scientific Culture in Modern Society”, given at the Galileo Symposium in Italy (1964). In: The Pleasure of Finding Things Out (1999)

http://en.wikipedia.org/wiki/Richard_Feynman 
http://en.wikiquote.org/wiki/Richard_Feynman