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One of the chief obstacles to intelligence is credulity, and credulity could be enormously diminished by instructions as to the prevalent forms of mendacity.

Bertrand Russell, Richard A. Rempel, Beryl Haslam (2000). “Uncertain Paths to Freedom: Russia and China, 1919-22”, p.360, Psychology Press
One of the chief obstacles to intelligence is credulity, and credulity could be enormously diminished by instructions as to the prevalent forms of mendacity.