And when we come to the message of the Prophet Muhammad, the central theme of the message is unity. He said, "The sultan and the slave, when they come in the Ka'aba, there is no distinction for them: they must stand shoulder to shoulder. " That was fifteen hundred years ago, and we have not learned that lesson. We are inclined to say, "He is from another race, he must keep away, he must not come to our restaurant; he is of a different class, he must stay in his place." Fifteen hundred years ago a man came and united his people, who were daggers-drawn against one another, divided by family feuds, saying, "My family is greater," and each family having its own gods.