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Full Idea
It is only when two species of object are found to be constantly conjoined, that we can infer the one from the other.
Gist of Idea
It is only when two species of thing are constantly conjoined that we can infer one from the other
Source
David Hume (Enquiry Conc Human Understanding [1748], XI.115)
Book Ref
Hume,David: 'Enquiries Conc. Human Understanding, Morals', ed/tr. Selby-Bigge/Nidditch [OUP 1975], p.148
A Reaction
what is a species?