The messages of the great teachers—Moses, the Buddha, Christ, Mohammed—differ greatly. But their visionary journeys are much the same. At the time of his election, Mohammed was an illiterate camel-caravan master. But every day he would leave his home in Mecca and go out to a mountain cave to meditate. One day a voice called to him, “Write!” and he listened, and we have the Koran. It’s an old, old story.