"The Hebrew prophets, and the steady expansion of their ideas towards one God in all the world, is a parallel development of the free conscience of mankind. From this time onward there runs through human thought, now weakly and obscurely, now gathering power, the idea of one rule in the world, and of a promise and possibility of an active and splendid peace and happiness in human affairs. From being a temple religion of the old type, the Jewish religion becomes, to a large extent, a prophetic and creative religion of a new type. Prophet succeeds prophet. Later on, as we shall tell, there was born a prophet of unprecedented power, Jesus, whose followers founded the great universal religion of Christianity. Still later Muhammad, another prophet, appears in Arabia and founds Islam. In spite of very distinctive features of their own, these two teachers do in a manner arise out of and in succession to these Jewish prophets. It is not the place of the historian to discuss the truth and falsity of religion, but it is his business to record the appearance of great constructive ideas. Two thousand four hundred years ago, and six or seven or eight thousand years after the walls of the first Sumerian cities arose, the ideas of the moral unity of mankind and of a world peace had come into the world."