“With insufficient data it is easy to go wrong.”

— Carl Sagan, book Cosmos

Source: Cosmos (1980), p. 94

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Carl Sagan365

American astrophysicist, cosmologist, author and science ed… 1934–1996

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

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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.

“It is wrong in all cases to believe on insufficient evidence; and where it is presumption to doubt and to investigate, there it is worse than presumption to believe.”

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

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Context: p>We may believe what goes beyond our experience, only when it is inferred from that experience by the assumption that what we do not know is like what we know. We may believe the statement of another person, when there is reasonable ground for supposing that he knows the matter of which he speaks, and that he is speaking the truth so far as he knows it.It is wrong in all cases to believe on insufficient evidence; and where it is presumption to doubt and to investigate, there it is worse than presumption to believe.</p

“I have experienced time and again people dismissing the data because they think MOND is wrong, so I am very consciously drawing a red line between the theory and the data.”

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as quoted in [Cooper, Keith, Correlation between galaxy rotation and visible matter puzzles astronomers, 7 October 2016, physicsworld.com, http://physicsworld.com/cws/article/news/2016/oct/07/correlation-between-galaxy-rotation-and-visible-matter-puzzles-astronomers]