““What is a ‘hunch’?”
“Eh? It’s a belief that something is so, or isn’t so, without evidence.”
“I’d call a hunch the result of automatic reasoning below the conscious level on data you did not know you possessed.””

Source: The Puppet Masters (1951), Chapter 28 (p. 149)

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Do you have more details about the quote "“What is a ‘hunch’?” “Eh? It’s a belief that something is so, or isn’t so, without evidence.” “I’d call a hunch the r…" by Robert A. Heinlein?
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Robert A. Heinlein 557
American science fiction author 1907–1988

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Variant: Trust your hunches. They're usually based on facts filed away just below the conscious level.
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Trust your hunches. Hunches are usually based on facts filed away just below the conscious level. But be warned, don't confuse hunches with wishful thinking.

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“You are living on a Plane. What you style Flatland is the vast level surface of what I may call a fluid, on, or in, the top of which you and your countrymen move about, without rising above it or falling below it.”

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