The fundamental difference ...

The fundamental difference between the mystery story and the ghost story is the fact that a mystery demands a solution for its effectiveness; a ghost story is necessarily unsolvable; the reader must be willing to accept the fact that nothing is proved.
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 Bennett Cerf

Quotes from the same author

Middle age is when your old classmates are so grey and wrinkled and bald they don't recognize you.
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 Bennett Cerf
There is a mass of people, we might as well admit, who if they weren't watching television, would be doing absolutely nothing else.
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 Bennett Cerf
TV's sameness has destroyed many things, such as the American urge toward independent thought.
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 Bennett Cerf