Full Idea
External considerations of reliability could not be internalized. Consequently, it is in principle impossible for us to actually employ externalist norms. I take this to be a conclusive refutation of belief externalism.
Clarification
'Norms' are principles guiding actions
Gist of Idea
Belief externalism is false, because external considerations cannot be internalized for actual use
Source
John L. Pollock (Epistemic Norms [1986], 'Ref.of Extern')
Book Reference
'Epistemology - An Anthology', ed/tr. Sosa,E. /Kim,J. [Blackwell 2000], p.197
A Reaction
Not so fast. He earlier rejected the 'intellectualist model' (Idea 8813), so he doesn't think norms have to be fully conscious and open to criticism. So they could be innate, or the result of indoctrination (sorry, teaching), or just forgotten.
Related Idea
Idea 8813 If we have to appeal explicitly to epistemic norms, that will produce an infinite regress [Pollock]