4. Again, as we have already hinted, the fall of the state and city of Jerusalem gave scope to ISRAEL'S MISSIONARY CAREER. The conviction, that had inspired many of Isaiah's assertions of the inviolableness of Zion, was the conviction that, if Zion were overthrown and the last remnant of Israel uprooted from the land, there must necessarily follow the extinction of the only true testimony to the living God which the world contained. But by a century later that testimony was firmly secured in the hearts and consciences of the people, wheresoever they might be scattered; and what was now needed was exactly such a dispersion,--in order that Israel might become aware of the world for whom the testimony was meant, and grow expert in the methods by which it was to be proclaimed. Priesthood has its human as well as its Godward side. The latter was already sufficiently secured for Israel by Jehovah's age-long seclusion of them in their remote highlands--a people peculiar to Himself. But now the same Providence completed its purpose by casting them upon the world. They mixed with men face to face, or, still more valuably to themselves, on a level with the most downtrodden and despised of the peoples. With no advantage but the truth, they met the other religions of the world in argument, debating with them upon the principles of a common reason and the facts of a common history. They learned sympathy with the weak things of earth. They discovered that their religion could be taught. But, above all, they became conscious of martyrdom, the indispensable experience of a religion that is to prevail; and they realised the supreme influence upon men of a love which sacrifices itself. In a word, Israel, in going into exile, put on humanity with all its consequences. How real and thorough the process was, how successful in perfecting their priesthood, may be seen not only from the hopes and obligations towards all mankind, which burst in our prophecy to an urgency and splendour unmatched elsewhere in their history, but still more from the fact that when the Son of God Himself took flesh and became man, there were no words oftener upon His lips to describe His experience and commission, there are no passages which more clearly mirror His work for the world, than the words and the passages in which these Jews of the Exile, stripped to their bare humanity, relate their sufferings or exult in their destiny that should follow.