Full Idea
It may seem a very extravagant attempt of the sceptics to destroy reason by argument and ratiocination; yet is this the grand scope of all their enquiries and disputes.
Gist of Idea
It is a very extravagant aim of the sceptics to destroy reason and argument by means of reason and argument
Source
David Hume (Enquiry Conc Human Understanding [1748], XII.II.124)
Book Reference
Hume,David: 'Enquiries Conc. Human Understanding, Morals', ed/tr. Selby-Bigge/Nidditch [OUP 1975], p.155