Discovery Quote by David Mermin

All is to be doubted.

— Rene Descartes

To doubt everything, or, to believe everything, are two equally convenient solutions; both dispense with the necessity of reflection.

— Anonymous

Skepticism is essential to the quest for knowledge, for it is in the seedbed of puzzlement that genuine inquiry takes root. Without skepticism, we…

— Paul Kurtz

These matters require what I think of as the Shakespearean cast of thought. That is to say, a fine credulity about everything, kept in…

— Robertson Davies

Philosophy, though unable to tell us with certainty what is the true answer to the doubts which it raises, is able to suggest many…

— Bertrand Russell

“In order to determine whether we can know anything with certainty, we first have to doubt everything we know”

— Anonymous

Skeptical scrutiny is the means, in both science and religion, by which deep thoughts can be winnowed from deep nonsense.

— Carl Sagan

Doubt, the essential preliminary of all improvement and discovery, must accompany the stages of man's onward progress. The faculty of doubting and questioning, without…

— Albert Pike

“Everything should be doubted and tested before it is held to be true.”

— Charles Nicholl

“To me it seems that those sciences are vain and full of error which are not born of experience, mother of all certainty, first-hand…

— Leonardo da Vinci

Skepticism is forever whispering in your ears. You're very new at this. You may be mistaken. You've been wrong before.

— D. J. Grothe

“In the real world it is meaningless to doubt existence; the doubt itself demonstrates the existence of the doubter.”

— Richard Rhodes