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Full Idea
All our ideas or more feeble perceptions are copies of our impressions or more lively ones.
Clarification
'Impressions' are basic sense experiences
Gist of Idea
All ideas are copies of impressions
Source
David Hume (Enquiry Conc Human Understanding [1748], II.13)
Book Ref
Hume,David: 'Enquiries Conc. Human Understanding, Morals', ed/tr. Selby-Bigge/Nidditch [OUP 1975], p.19