“It is our responsibility as scientists, knowing the great progress which comes from a satisfactory philosophy of ignorance, the great progress which is fruit of freedom of thought, to proclaim the value of this freedom; to teach how doubt is not to be feared but welcomed and discussed; and to demand this freedom as our duty to all coming generations”

:Richard Feynman in The Value of Science in What Do You Care What Other People Think?

“What, then, is the meaning of it all? What can we say to dispel the mystery of existence?

If we take everything into account – not only what the ancients knew, but all of what we know today that they didn’t know – then I think we must frankly admit that we do not know.”

:Richard Feynman in The Value of Science in What Do You Care What Other People Think?

“Bad can be taught at least as efficiently as good. Education is a strong force, but for either good or evil.”

:Richard Feynman in The Value of Science in What Do You Care What Other People Think?

“… we scientists are used to this, and we take it for granted that it is perfectly consistent to be unsure, that it is possible to live and not know.”

:Richard Feynman in The Value of Science in What Do You Care What Other People Think?

“When playing Russian roulette, the fact that the first shot got off safely is of little comfort for the next.”

:Richard Feynman in Appendix F in What Do You Care What Other People Think?