Full Idea
It was fear of scepticism based upon representative realism that motivated Berkeley's idealism.
Gist of Idea
Berkeley's idealism resulted from fear of scepticism in representative realism
Source
comment on George Berkeley (The Principles of Human Knowledge [1710]) by Howard Robinson - Perception II.1
Book Reference
Robinson,Howard: 'Perception' [Routledge 2001], p.33
A Reaction
Personally I side with Russell, who accepts representative realism, and also accepts that some degree of scepticism is unavoidable, but without getting excited about it. The key to everything is to be a 'fallibilist' about knowledge.