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Full Idea
Universal scepticism, though logically irrefutable, is practically barren; it can only, therefore, give a certain flavour of hesitancy to our beliefs, and cannot be used to substitute other beliefs for them.
Gist of Idea
Global scepticism is irrefutable, but can't replace our other beliefs, and just makes us hesitate
Source
Bertrand Russell (Our Knowledge of the External World [1914], 3)
Book Ref
Russell,Bertrand: 'Our Knowledge of the External World' [Routledge 1993], p.74
A Reaction
Spot on. There is no positive evidence for scepticism, so must just register it as the faintest of possibilities, like the existence of secretive fairies.