The fatal tendency of mankind to leave off thinking about a thing when it is no longer doubtful, is the cause of half their errors. – John Stuart Mill

Common experience shows how much rarer is moral courage than physical bravery. A thousand men will march to the mouth of the cannon where one man will dare espouse an unpopular cause. – Clarence Darrow, Resist Not Evil

False opinions are like false money, struck first of all by guilty men and thereafter circulated by honest people who perpetuate the crime without knowing what they are doing. – Joseph De Maistre