More quotes by Richard Feynman

"The first principle is that you must not fool yourself and you are the easiest person to fool."
"If you thought that science was certain - well, that is just an error on your part."
"You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird... So let's look at the bird and see what it's doing -- that's what counts."
"I learned very early the difference between knowing the name of something and knowing something."
"Science is what we have learned about how to keep from fooling ourselves."