“I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wilder and more ridiculous something is, however, the firmer and more solid the evidence will have to be.”

“Don't you believe in flying saucers, they ask me? Don't you believe in telepathy? — in ancient astronauts? — in the Bermuda triangle? — in life after death?No, I reply. No, no, no, no, and again no.One person recently, goaded into desperation by the litany of unrelieved negation, burst out "Don't you believe in anything?"Yes", I said. "I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wilder and more ridiculous something is, however, the firmer and more solid the evidence will have to be.”

“To believe in nothing is as ridiculous as to believe in everything. Reason and factual evidence may convert a belief into knowledge.”

“I want to believe that, despite all the evidence to the contrary, there is reason to hope.”

“You're always believing ahead of your evidence. What was the evidence I could write a poem? I just believed it. The most creative thing in us is to believe in a thing.”

“I destroy because for me everything that proceeds from reason is untrustworthy. I believe only in the evidence of what stirs my marrow, not in the evidence of what addresses itself to my reason. I have found levels in the realm of the nerve. I now feel capable of evaluating the evidence. There is for me an evidence in the realm of pure flesh which has nothing to do with the evidence of reason. The eternal conflict between reason and the heart is decided in my very flesh, but in my flesh irrigated by nerves...”