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Full Idea
External or objective reliability is not enough to offset subjective irrationality (such as unexplained clairvoyance).
Gist of Idea
External reliability is not enough, if the internal state of the believer is known to be irrational
Source
Laurence Bonjour (Externalist Theories of Empirical Knowledge [1980], §IV)
Book Ref
'Epistemology: Internalism and Externalism', ed/tr. Kornblith,Hilary [Blackwell 2001], p.20
A Reaction
A good argument. Where do animals fit into this? If your clairvoyance kept working, in the end you might concede that you 'knew', even though you were baffled about how you managed it.