It has been suggested that criticism seems to assume that religion progressed until it reached a certain height in the Eighth Century, and to enable this theory to stand all marks of this supposed later type appearing earlier are classed as interpolations. It is usual to trace this theory to "Evolution gone mad." Even on the critical theories this cannot however be legitimately shown to result, since critical reconstruction shows that the supreme height gained in the Prophets was never maintained, but suffered a perceptible decline. Whatever the guiding idea of criticism may be, it cannot be an endeavour to make the history of Israel's religion confirm some theory of the natural development and evolution of religion. The critical theories leave us with the problem of moral lapses to account for and with the failure of vision to explain, and demand still a moral insight to detect the cause. But it is clear to many that the moral causes do stand out more clearly discoverable by this method.
The critical theory of the priority of the Prophets is not based only upon the emergence under their teaching of certain theological ideas for the first time; but also on the difference of style and vocabulary which can be recognised after only a slight acquaintance with the language; and on the general outline of the history that the Bible itself forces upon us. It is a fact which the reader can soon discover for himself, that the historical Books are compilations from the records of various ages, and these various ages can be as easily discerned as the conflicting styles of an oft-restored church, or the disturbance of the normal geological strata that demands some upheaval for its explanation. It must be remembered that all this is made possible from the fact of the remarkable uniformity of ideas that characterises the various stages of Hebrew religion.
The Prophets' teaching can therefore be traced outside their own writings; mainly in fragmentary comments added to the narratives; or in a superimposed colouring, which easily falls off, leaving the original outlines in view; but it is supposed to be found grouped into one great mass in the Book of Deuteronomy. The critics' theory of this Book is that it is an endeavour to reduce the teaching of the Prophets, more especially that of Isaiah, to a code, and to secure reform by the centralisation of worship at Jerusalem. This idea of a central worship, which leaves no record of its actual observance until the time of Josiah, or perhaps an attempt in the reign of Hezekiah, is so unmistakable and is so uniformly expressed that the work of this author (perhaps we should say, this school) can be easily detected, and many of the Books, such as Judges and Kings, can be seen to have been subjected to a "Deuteronomist" redaction. In all these phenomena we have teaching that presupposes the Prophets, and that stands in contrast and often in conflict with the general tone of the original. It is remarkable that with such redactions of history any clue to the earlier conceptions should have been left to us, especially that there should have been left in the records anything that would be in disagreement with the editors' ideas, but the Jews, like the other nations of antiquity, did not possess modern notions of exactness, and their notions of history prevented them from understanding things that were removed only a short distance from their own times.