“Just as there are Laws of Conservation of Matter and Energy, so there are in fact Laws of Conservation of Pain and Joy. Neither can ever be created or destroyed.
But one can be converted into the other.”

—  Spider Robinson , book Callahan's Crosstime Saloon

Source: Callahan's Crosstime Saloon (1977) "Laws of Conservation of Pain and Joy"

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Spider Robinson 32
Canadian author 1948

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