Full Idea
Scepticism is undermined once it is seen that the relevant kind of justification is not a matter of derivation from basic principles but is rather a matter of showing that a view fits in well with other things we believe.
Gist of Idea
Coherence avoids scepticism, because it doesn't rely on unprovable foundations
Source
Gilbert Harman (Thought [1973], 10.4)
Book Reference
Harman,Gilbert: 'Thought' [Princeton 1977], p.164
A Reaction
I would (now) call myself a 'coherentist' about justification, and I agree with this. Coherent justification could not possibly deliver certainty, so it must be combined with fallibilism.