Full Idea
How can the fact that a belief is reliably produced make my acceptance of that belief rational and responsible when that fact itself is entirely unavailable to me?
Gist of Idea
If the reliable facts producing a belief are unknown to me, my belief is not rational or responsible
Source
Laurence Bonjour (A Version of Internalist Foundationalism [2003], 2.2)
Book Reference
Bonjour,L/Sosa,E: 'Epistemic Justification' [Blackwells 2003], p.27
A Reaction
This question must rival Pollock's proposal (Idea 8815) as the master argument against externalism. Bonjour is assuming that knowledge has to be 'rational and responsible', but clearly externalists take a more lax view of knowledge.
Related Idea
Idea 8815 Belief externalism is false, because external considerations cannot be internalized for actual use [Pollock]