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Scientists don’t arrive at the truth by inward certainty or by majority vote, but they do demonstrate it to each other (and to other men) by open and rational procedures. If an experiment or observation can’t be repeated, it can’t be accepted, no matter how great the reputation, scientific or otherwise, of the man who says he did it or saw it.

— Fritz Leiber

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Source and credibility

Wikiquote does not flag this quote as disputed or misattributed.

Source: Terror, Mystery, Wonder (1980), in The World Fantasy Awards Volume 2, p. xvii
Source quality: Precise citation Points to a specific work with a page, chapter, date or similar locator, so you can look it up.

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What is superstition, but misguided, unobjective science?

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Devils may be nothing but beings intent on their purpose, which now happens to collide with yours.

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Know it or not, man treads between abysses a tightrope that has neither beginning nor end.

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He who lies artistically, treads closer to the truth than ever he knows.

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Unlike men, rubies and emeralds do not rest quietly in their graves.

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That is as far from the truth as I am from the Secret of the Sphinx.

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Let never the gems of business be mixed with the jewels of pleasure.

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Science

More quotes by Fritz Leiber

And the mighty are great worriers and spend much time preventing anything that troubles their peace of mind.

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I thought of how people are like planets—lonely little forts of mind with immense black distance barring them off from each other.

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Women have power over men almost as great as gods do.

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To Space-Age man, every mystery is a greed-magnet.

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Too much good luck was always dangerous.

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

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Attribution

Quote text and notes from Wikiquote: Fritz Leiber (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.