Full Idea
Conceiving of the virtues in terms of faculties or powers doesn't help at all with the problem of accounting for propositional knowledge.
Gist of Idea
If epistemic virtues are faculties or powers, that doesn't explain propositional knowledge
Source
Jonathan Kvanvig (Virtue Epistemology [2011], IV B)
Book Reference
'Routledge Companion to Epistemology', ed/tr. Bernecker,S/Pritchard,D [Routledge 2014], p.204
A Reaction
It always looks as if epistemic virtues are a little peripheral to the main business of knowledge, which is getting beliefs to be correct and well-founded. Given that epistemic saints make occasional mistakes, talk of virtues can't be enough.