Full Idea
The foundationalists dilemma is to define a basis for knowledge modest enough to be secure but rich enough to be adequate.
Gist of Idea
Foundationalists are torn between adequacy and security
Source
Michael Williams (Problems of Knowledge [2001], Ch. 7)
Book Reference
Williams,Michael: 'Problems of Knowledge' [OUP 2001], p.85
A Reaction
..And that is just what they are unable to do, precisely because adequate support would have to have enough content to be defeasibe or fallible.