Still, the interpretation thus reached does not exclude--it distinctly includes--the Messianic reference. If the passage promises that at all moments of difficulty and crisis in Israel's history, the will of God would be made known by a Divinely sent prophet, that would be specially true of the last and greatest crisis, the birth of the new time which the Messiah was to inaugurate. Whatever fulfilment the promise might receive previously to that, it could not be perfectly fulfilled without the advent of Him whose office it was to close up the history of the present world, and bring all things by a safe transition into the new Messianic world. That was the greatest crisis; and necessarily the prophet who spoke for Yahweh in it must be the crown of the long line of prophets. There is still a higher sense in which this promise has reference to the Messiah. He was to sum up and realise in Himself all the possibilities of Israel. Now they were the prophetic nation, the people who were to reveal God to mankind; and when they proved prevailingly false to their higher calling, the hopes of all who remained faithful turned to that "true" Israel which alone would inherit the promises. At one period, just before and in the Exile, the prophetic order would appear to have been looked upon as the Israel within Israel, to whom it would fall to accomplish the great things to which the seed of Abraham had been called. But the author of Second Isaiah, despairing even of them, saw that the destiny of Israel would be accomplished by one great Servant of Yahweh, who should outshine all other prophets, as He would surpass all other Israelite priests and Davidic kings. As the crown and embodiment of all that the prophets had aspired to be, the Messiah alone completely fulfilled this promise, and consequently the Messianic reference is organically one with the primary reference. They are so intimately interwoven that nothing but violence can separate them; and thus we gain a deeper insight into the wide reach of the Divine purposes, and the organic unity of the Divine action in the world. These form a far better guarantee for the recognition of Messianic prophecy here than the supposed direct and exclusive reference did. By not grasping too desperately at the view which more strikingly involves the supernatural, we have received back with "full measure pressed down and running over" the assurance that God was really speaking here, and that this, like all the promises of the Old Testament when rightly understood, is yea and amen in Christ.
But for our present purpose the primary reference of this passage to the prophetic line is even more important than the secondary but most vital reference to the Messiah. For it sets forth prophecy as the most potent instrument for the growth and furtherance of the religion of Israel. The prophet is here declared to be the successor of Moses, to be the inspired declarer of the Divine will to His people in cases which did not come within the sphere or the competency of the priest. The latter was, as we have seen, bound to work within the limits and on the basis of the revelation given by Moses. He was to carry out into execution what had been commanded, to keep alive in the hearts of the people the knowledge of their God as Moses had given it, to give "Torah" from the sanctuary in accordance with its principles. But here a nobler office is assigned to the prophet. He is to enlarge and develop the work of Moses. The Mosaic revelation is here viewed as fundamental and normative, but, in contrast to the views of later Judaism, as by no means complete. For the completion of it the prophet is here declared to be the Divinely chosen instrument, and he is consequently assigned a higher position in the purpose of God than either king or priest. He is raised far above the diviners by having his calling lifted into the moral sphere; and he excels both the other organs of national life in that, while they are largely bound by the past, he is called of God to initiate new and higher stages in the life of the chosen people. The ascending steps of the revelation begun by Moses were to be in his hands, and through him God was to reveal Himself in ever fuller measure.