Now in religious thought this is quite unparalleled. Tenacious conservatism, based on the conviction that full truth has already been attained, has always been the mark of religious thinking. That a religious teacher should be able to see that the light of revelation, like the natural light, must come gradually, broadening by degrees into perfect day, and that he himself was standing only in the morning twilight, is a thing so remarkable that one is at a loss to account for it, save on the ground of the special nature of prophetic enlightenment. It was part of the office of the prophets to foresee and foretell the future. Smend is certainly in the right, as against those who have been teaching that the prophet was merely a preacher of genius, when he says that "in Amos and his successors prophecy is the starting-point of their whole discourse and action," and that "all new knowledge which they preach comes to them from the action of Yahweh which they foretell.... Consequently the greatness of a prophet is to be gathered from the measure in which he foresees the future."[95] This statement gives us the truth that lies between the two other extremes; for according to it the prophet proclaims and preaches religious truth, but he does so on the basis of what he perceives that God is about to do in the future. In other words, he proclaims new truth on the ground of the revelation God is about to make of Himself, which he is inspired to foresee and to interpret. His business is neither all foreseeing nor all teaching; it is teaching grounded upon foresight. Consequently it was impossible for the prophet to believe that change in religion was in itself evil. He _knew_ to the contrary. Only change which should remove men from the Divinely given basis of the faith was evil; and such change, whatever credentials might accompany it, even though they might be miraculous, every faithful Israelite had been already warned most sternly to reject (Deut. xiii. 5). But when the impulse to advance came from Yahweh's manifestation of Himself, change was not only good, it was the indispensable test of faithfulness. They were not the true followers of Isaiah who, on the ground of his prophecy that Zion, as Yahweh's dwelling-place, should be delivered from destruction, rejected the prophecy of Jeremiah that Zion would fall before the Chaldeans. The really faithful men were those who had taken to heart the lessons Yahweh had set for His people in the century that lay between these two prophets; who saw that the time when the deliverance of Zion was necessary to the safety of the true religion was past, and that now the capture of Zion was necessary to its true development. And that is not a solitary case; it is an example of what was normal in the religious history of this people. [95] _Lehrbuch der Alt-Testamentlichen Religion's Geschichte_, pp. 169 ff.