Piety (n.) at dinner is eating politely and with restraint, and not losing your temper when the slave brings the water lukewarm.
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Piety (n.) cannot survive unless it goes hand in hand with self-interest.
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Piety (n.) follows interest: where a man thinks his good lies, there lies his worship — which is why farmers, sailors and the bereaved curse the gods.
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Piety (n.) follows interest: where a man's interest lies, there is his piety — so the farmer, the sailor and the bereaved revile the gods.
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Piety (n.) survives only where it coincides with self-interest: whoever counts health and life as goods will, on losing them, curse Zeus and knock down his statues.