“evidence is the only good reason to believe anything”

— Richard Dawkins

interview shown in AlJazeera https://www.youtube.com/watch?v=U0jA6VsivBE&t=0h26m04s, https://www.youtube.com/watch?v=U0jA6VsivBE&t=0h28m37s

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Richard Dawkins 322

English ethologist, evolutionary biologist and author 1941

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“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.”

Isaac Asimov (1920–1992) American writer and professor of biochemistry at Boston University, known for his works of science fiction …

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."

“You can’t convince a believer of anything; for their belief is not based on evidence, it’s based on a deep seated need to believe.”

Carl Sagan (1934–1996) American astrophysicist, cosmologist, author and science educator

Sometimes attributed to Contact (1985), but the quote does not appear in that book.
It appears attributed to Sagan in Judson Poling's 2003 book "Do Science and the Bible Conflict?", but without source.
Misattributed
Source: Via Google Books https://books.google.com/books?id=Ondv5WzhYYYC&pg=PA21&dq=Sagan

“To sum up: it is wrong always, everywhere, and for anyone, to believe anything upon insufficient evidence.”

William Kingdon Clifford (1845–1879) English mathematician and philosopher

The Ethics of Belief (1877), The Duty of Inquiry
Context: To sum up: it is wrong always, everywhere, and for anyone, to believe anything upon insufficient evidence.
If a man, holding a belief which he was taught in childhood or persuaded of afterwards, keeps down and pushes away any doubts which arise about it in his mind, purposely avoids the reading of books and the company of men that call into question or discuss it, and regards as impious those questions which cannot easily be asked without disturbing it--the life of that man is one long sin against mankind.

“Man is a masterpiece of creation if for no other reason than that, all the weight of evidence for determinism notwithstanding, he believes he has free will.”

Georg Christoph Lichtenberg (1742–1799) German scientist, satirist

J 249
Aphorisms (1765-1799), Notebook J (1789)

“Theism is irrational by definition, because it is not based on reason and is not reasonable. There was no evidence indicating this conclusion, yet it is a firm conviction anyway, and believers are determined not to let any evidence change their minds either. The very purpose and existence of apologetics all by itself demonstrates how theism is irrational.”

Aron Ra (1962) Aron Ra is an atheist activist and the host of the Ra-Men Podcast

Patheos, Philosophistry http://www.patheos.com/blogs/reasonadvocates/2017/04/12/philosophistry/ (April 12, 2017)

“Don't believe anything they write about you, good or bad.”

Babe Ruth (1895–1948) American baseball player

Advice to Red Grange as quoted in The Wicked City: Chicago from Kenna to Capone (1998) by Curt Johnson and R. Craig Sautter, p. 159; Unsourced variant: Don't ever forget two things I'm going to tell you. One, don't believe everything that's written about you. Two, don't pick up too many checks.
Context: Keed, I'll give you a little bit of advice. Don't believe anything they write about you, good or bad. Two, get the dough while the getting is good, but don't break your heart trying to get it. And don't pick up too many checks!