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Full Idea
If an arrogant young physicist refuses to recognise valid criticisms from a senior colleague, his or her character has nothing to do with the epistemic status of their belief in the theory.
Gist of Idea
If someone rejects good criticism through arrogance, that is irrelevant to whether they have knowledge
Source
R Feldman / E Conee (Evidentialism [1985], III)
Book Ref
'Epistemology - An Anthology', ed/tr. Sosa,E. /Kim,J. [Blackwell 2000], p.173
A Reaction
This rejects the idea that epistemic justification is essentially a matter of virtues and vices of character. That view is a version of reliabilism, and hence of externalism. I agree with the criticism, but epistemic virtues are still significant.