The wonderful burst of praise which sprang from David's heart in answer cannot be dealt with here; but clearly from that time onwards a new element had been added to his hopes, and a new object presented to his faith. The prophecy of the Messiah enters upon a new stage, bearing a relation, as its successive stages, always unmistakably did, to the history which supplies a framework for it. Now for the first time can he be set forth as the king of Israel; now the width of the promise which at first had embraced the seed of the woman, and then had been narrowed to the seed of Abraham, and thereafter probably to the tribe of Judah, is still further defined as to be fulfilled in the line of the house of David; now the personal Messiah Himself begins to be discerned through the words which are to have a preparatory fulfilment, in itself prophetic, in the collective Davidic monarchs whose very office is itself also a prophecy. Many echoes of this new message ring through the later psalms of the king. His own dominion, his conquests, and his office, gradually became to himself a solemn prophecy of a mysterious descendant who should be really and fully all that he was in shadow and in part. As the experience of the exile, so that of the victorious monarch supplied the colours with which the spirit of prophecy in him painted "beforehand the sufferings of Christ and the glory that should follow." In both classes of psalms we have two forms of the Messianic reference, the typical and the purely prophetic. In the former the events of David's own biography and the feelings of his own soul are so portrayed and expressed as to suggest his greater Son. In the latter, the personality of the psalmist retreats into the background, and is at most only the starting-point for wails of sorrow or gleams of glory which far transcend anything in the life of the singer. There are portions, for instance, of the xxii. and lxix. psalms which no torturing can force into correspondence with any of David's trials; and in like manner there are paeans of victory and predictions of dominion which demand a grander interpretation than his own royalty or his hopes for his house can yield. Of course, if prophecy is impossible, there is no more to be said, but that in that case a considerable part of the Old Testament, including many of David's psalms, is unintelligible.