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Short of actual blunders, lack of faith in one's position is the chief cause of defeat. To be sure, it is easy to recommend faith and not so easy to practise it.

Fred Reinfeld (1961). “Great Short Games of the Chess Masters”, p.201, Courier Corporation
Short of actual blunders, lack of faith in one's position is the chief cause of defeat. To be sure, it is easy to recommend faith and not so easy to practise it.