I've just watched Shakespeare's Merchant of Venice, and Shylock says: If a Jew wrong a Christian, what is his humility? Revenge. If a Christian wrong a Jew, what should his sufferance be by Christian example? Why, revenge. The villany you teach me, I will execute, and it shall go hard but I will better the instruction. And later, Jessica says: If law, authority and power deny not, It will go hard with poor Antonio.