Full Idea
Trite sceptical examples, such as the oar bent in water, or double images when the eye is pressed, are only sufficient to prove that senses alone are not dependable, but we must correct their evidence with reason.
Gist of Idea
Examples of illusion only show that sense experience needs correction by reason
Source
David Hume (Enquiry Conc Human Understanding [1748], XII.I.117)
Book Reference
Hume,David: 'Enquiries Conc. Human Understanding, Morals', ed/tr. Selby-Bigge/Nidditch [OUP 1975], p.151