Full Idea
The floating of other Mens Opinions in our brains makes us not one jot the more knowing, though they happen to be true.
Gist of Idea
Other men's opinions don't add to our knowledge - even when they are true
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 1.04.23)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.101
A Reaction
Kusch calls this thought of Locke's 'notorious'. Locke is certainly expressing extreme individualism in epistemology, and Kusch's views are the exact opposite. I'm more with Kusch.