William Penn became a Quaker in 1666, and immediately realized he had a problem. He was a member of the court of King Charles II. As a courtier, he was expected to wear a sword; as a Quaker, he had abjured the sword’s use. What to do? Legend says that he approached George Fox with this conundrum, and Fox cut through it with a simple test: Wear thy sword as long as thou canst.