Doubt is clearly a value in science. It is important to doubt and that the doubt is not a fearful thing, but a thing of great value.
Richard P. FeynmanIt is the facts that matter, not the proofs. Physics can progress without the proofs, but we can't go on without the facts ... if the facts are right, then the proofs are a matter of playing around with the algebra correctly.
Richard P. FeynmanScientific knowledge is a body of statements of varying degrees of certainty -- some most unsure, some nearly sure, none absolutely certain.
Richard P. Feynman