Full Idea
Infallible beliefs must have vanishingly small content. No belief with enough content to support the superstructure in which we are really interested is going to be infallible.
Gist of Idea
Beliefs can only be infallible by having almost no content
Source
Jonathan Dancy (Intro to Contemporary Epistemology [1985], 4.2)
Book Reference
Dancy,Jonathan: 'Introduction to Contemporary Epistemology' [Blackwell 1985], p.60
A Reaction
I see no reason why a foundationalist should not be a fallibilist, rather than insisting on the infallibility of their basic beliefs. I don't, though, see how basic beliefs can count as knowledge.