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

People still retain the errors of their childhood, their nation, and their age, long after they have accepted the truths needed to refute them. – Condorcet, Progress of the Human Mind, 1794

I had an immense advantage over many others dealing with the problem inasmuch as I had no fixed ideas derived from long-established practice to control and bias my mind, and did not suffer from the general belief that whatever is, is right. – Henry Bessemer (discovered new method of producing steel)