Full Idea
Reason can never find any convincing argument from experience to prove that perceptions are connected with any external objects.
Gist of Idea
Reason can never show that experiences are connected to external objects
Source
David Hume (Enquiry Conc Human Understanding [1748], XII.I.121)
Book Reference
Hume,David: 'Enquiries Conc. Human Understanding, Morals', ed/tr. Selby-Bigge/Nidditch [OUP 1975], p.154