“Give me such evidence as would justify me in believing in anything else and I will believe that. Why should I not? It is not half so wonderful as the conservation of force, or the indestructibility of matter. Whoso clearly appreciates all that is implied in the falling of a stone can have no difficulty about any doctrine simply on account of its marvelousness But the longer I live, the more obvious it is to me that the most sacred act of a man's life is to say and to feel, 'I believe such and such to be true.' All the greatest rewards and all the heaviest penalties of existence cling about that act. The universe is one and the same throughout; and if the condition of my success in unraveling some little difficulty of anatomy or physiology is that I shall rigorously refuse to put faith in that which does not rest on sufficient evidence, I cannot believe that the great mysteries of existence will be laid open to me on other terms…. I know what I mean when I say I believe in the law of the inverse squares, and I will not rest my life and hopes upon weaker convictions. I dare not if I would.”
1860s, Reply to Charles Kingsley (1860)
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Thomas Henry Huxley 127
English biologist and comparative anatomist 1825–1895Related quotes

Billy the Kid's comment to a Las Vegas Gazette reporter (December, 1880)
About Billy the Kid website http://www.aboutbillythekid.com/index.html

Source: The Roving Mind (1983), p. 43
Context: 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."

Song - I pray thee let me weep to-night
The Venetian Bracelet (1829)

Sigmund Freud, in a letter to Siegfried Hessing. As quoted in António Damásio's Looking for Spinoza: Joy, Sorrow, and the Feeling Brain (Orlando, FL: Harcourt, 2003)
A - F

Year unknown, published in 2001, The Quotable Walt Disney (2001)

It has certainly been my experience.
John Pilger, This much i know http://www.guardian.co.uk/media/2005/nov/13/pressandpublishing.observermagazine, The Observer, 13 November 2005

It’s not what somebody believes, it’s experimental proof that counts. And those guys don’t have that.
California Monthly, September 1994.