How gradually, and how naturally, the advancing thoughts and changed circumstances of Israel affected the Decalogue may be seen most clearly in the differences between its form as originally given, and as it is set forth in Exodus and in Deuteronomy. If the original form of these commandments was what we have indicated (p. 69), they corresponded entirely to the circumstances of the wilderness. There is no reference in them which presupposes any other social background than that of a people dwelling together according to families, possessing property, and worshipping Yahweh. None of the commandments involves a social state different from that. But when Israel had entered upon its heritage, and had become possessed of the oxen and asses which were needed in agricultural labour and in settled life, this stage of their progress was reflected in the reasons and inducements which were added to the original commands. In the fourth and tenth commandments of Exodus we have consequently the essential commandments of the earlier day adapted to a new state of things, _i.e._ to a settled agricultural life. Then, even as between the Exodus and Deuteronomic texts, a progress is perceptible. The reasons for keeping the Sabbath which these two recensions give are different, as we have seen, and it is probable that the reason given in Deuteronomy was first. To the people in the wilderness came the bare Divine command that this one day was to be sacred to Yahweh. In both Exodus and Deuteronomy we have additions, going into details which show that when these versions were prepared Israel had ceased to be nomadic and had become agricultural. In Deuteronomy we find that the importance and usefulness of this command from a humane point of view had been recognised, and one at least of the grounds upon which it should be held a point of morality to keep it is set forth in the words "that thy manservant and thy maidservant may rest as well as thou." Finally, if the critical views be correct, in Exodus we have the motive for the observance of the Sabbath raised to the universal and eternal, by being brought into connection with the creative activity of God.
If the progression now traced out be real, then we have in it a classical instance of the manner in which Divine commands were given and dealt with in Israel. Given in the most general form at first, they inevitably open the way for progress, and as thought and experience grow in volume and rise in quality, so does the understanding of the law as given expand. Under the influence of this expansion addition after addition is made, till the final form is reached; and the whole is then set forth as having been spoken by Yahweh and given by Moses when the command was first promulgated. In such cases literary proprietorship was never in question. Each addition was sanctioned by revelation, and those by whom it came were never thought of. It would seem, indeed, that nothing but modern sceptical views as to the reality of revelation, the feeling that all this movement to a higher faith was merely natural, and that the hand of God was not in it, could have suggested to the ancient Hebrew writers the wish to hand on the names of those by whom such changes were made. Yahweh spoke at the beginning, Moses mediated between the people and Yahweh, and the law thus mediated was in all forms equally Mosaic, and in all forms equally Divine.
One other thing remains to be noticed, and that is the prevailingly negative form of the commandments. Of the ten only the fourth and fifth are in the affirmative. All the others are prohibitions, and we who have been taught by Christianity to put emphasis upon the positive aspects of duty as the really important aspects of it, may not improbably feel chilled and repelled by a moral code which so definitely and prevailingly forbids. But the cause of this is plain. A code like that of the Twelve Tables published in early Rome is only occasionally negative, because it rises to no great height in its demands, and is intent only upon ordering the life of the citizens in their outward conduct. But this code, which seeks to raise the whole of life into the sacredness of a continual service of God and man, must forbid, because the first condition of such a life is the renunciation and the restriction of self. Benevolent dreamers and theorists of all ages, and men of the world whose moral standard is merely the attainment of the average man, have denied the evil tendency in man's nature. They have asserted that man is born good; but the facts of experience are entirely against them. Whenever a serious effort has been made to raise man to any conspicuous height of moral goodness, it has been found necessary to forbid him to follow the bent of his nature. "Thou shalt not" has been the prevailing formula; and in this sense original sin has always been witnessed to in the world. Hence the Old Testament, in which the most strenuous conflict for goodness which the world in those ages knew was being carried on, could not fail, in every part of it, to proclaim that man is not born good. However late we may be compelled to put the writing of the story of the fall as it stands in Genesis, there can be no question that it represents the view of the Old Testament at all times. Man is fallen; he is not what he ought to be, and the evil taint is handed on from one generation to another. Every generation, therefore, is called, by prophet and priest and lawgiver alike, to the conflict against the natural man.