We never can conceive any thing but perceptions, and therefore must make every thing resemble them.
 David Hume, A Treatise of Human Nature (1738). copy citation

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Author David Hume
Source A Treatise of Human Nature
Topic perception
Date 1738
Language English
Reference
Note
Weblink http://www.gutenberg.org/files/4705/4705-h/4705-h.htm

Context

“And I shall farther add, that even though they coued afford such a conclusion, we should never have any reason to infer, that our objects resemble our perceptions. That opinion, therefore, is derived from nothing but the quality of the fancy above-explained, (that it borrows all its ideas from some precedent perception) . We never can conceive any thing but perceptions, and therefore must make every thing resemble them. Secondly, As we suppose our objects in general to resemble our perceptions, so we take it for granted, that every particular object resembles that perception, which it causes. The relation of cause and effect determines us to join the other of resemblance;” source