Yield to all and you will soon have nothing to yield. – Aesop, “The Man and His Two Wives,” Fables

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

Civilization advances by extending the number of important operations which we can perform without thinking. – Alfred North Whitehead

Keep your minds open, but not so open that your brains fall out. – Walter Kotschnig, c.1940