Richard P. Feynman > Quotes > Quote > Nick liked it

“We have found it of paramount importance that in order to progress we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of certainty—some most unsure, some nearly sure, but none absolutely certain.”
― Richard P. Feynman, 'What Do You Care What Other People Think?': Further Adventures of a Curious Character