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

Mental slavery is mental death, and every man who has given up his intellectual freedom is the living coffin of his dead soul. – Robert Ingersoll, Individuality

We must not overlook the role that extremists play. They are the gadflies that keep society from being too complacent. – Abraham Flexner, Universities, 1930