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Be very slow to believe that you are wiser than all others; it is a fatal but common error. Where one has been saved by a true estimation of another's weakness, thousands have been destroyed by a false appreciation of their own strength.

Charles Caleb Colton (1823). “Remarks on the Talents of Lord Byron and the Tendencies of Don Juan”, p.103
Be very slow to believe that you are wiser than all others; it is a fatal but common error. Where one has been saved by a true estimation of another's weakness, thousands have been destroyed by a false appreciation of