Full Idea
Accuracy of response to stimulus does not alone show knowledge, but must be reinforced by appropriateness, i.e. suitability of realising one's purpose.
Gist of Idea
Knowledge needs more than a sensitive response; the response must also be appropriate
Source
Bertrand Russell (The Analysis of Mind [1921], p.261), quoted by Michael Potter - The Rise of Analytic Philosophy 1879-1930 66 'Rel'
Book Reference
Potter,Michael: 'The Rise of Anaytic Philosophy 1879-1930' [Routledge 2020], p.430
A Reaction
The aim of 'realising one's purpose' puts a very pragmatist spin on this. The point is a good one, and seems to apply particularly to Nozick's accurate 'tracking' account of knowledge.
Related Idea
Idea 22325 A belief is knowledge if it is true, certain and obtained by a reliable process [Ramsey]