Full Idea
We always presume, when we see like sensible qualities, that they have like secret powers, and expect that effects, similar to those which we have experienced, will follow from them. …Thus, we expect bread to nourish us, from previous experience.
Gist of Idea
We assume similar secret powers behind similar experiences, such as the nourishment of bread
Source
David Hume (Enquiry Conc Human Understanding [1748], IV.II.29)
Book Reference
Hume,David: 'Enquiries Conc. Human Understanding, Morals', ed/tr. Selby-Bigge/Nidditch [OUP 1975], p.33