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Quotation from An Enquiry Concerning Human Understanding by David Hume
“nor has rhubarb always proved a purge, or opium a soporific to every one, who has taken these medicines”
An Enquiry Concerning Human Understanding, Section VI (Project Gutenberg #9662)

Hume's example of causes with irregular effects, from which probabilities rather than certainties arise.
Citation: "nor has rhubarb always proved a purge, or opium a soporific to every one, who has taken these medicines" — David Hume, An Enquiry Concerning Human Understanding, Section VI (Project Gutenberg #9662). (id an-enquiry-concerning-human-understanding-q5)
Portrait: David Hume, Allan Ramsay, Public domain.
