Quote by Richard Feynman

"The first principle is not to fool yourself because that's where you're easiest to fool."

Richard Feynman
Theoretical Physicist American 1918–1988

More from Richard Feynman

"The first principle is that you must not fool yourself, and you are the easiest person to fool."
"What I cannot create, I do not understand."
"The pleasure of finding things out is the most important thing."
"You don't have to know everything to do something."

All quotes by Richard Feynman