Enlightened and assured by this great revelation of God, Moses left the quiet of the desert to undertake an extraordinarily difficult task. He had to weld jealous tribes into a nation; he had to rouse men whose courage had been broken by slavery and cruelty to undertake a dangerous revolt; and he had to prepare for the march of a whole population, burdened with invalids and infants, the feeble and the old, through a country which even to-day tries all but the strongest. These things had to be done; and the mere fact that they were accomplished would be inexplicable, without the domination of a great personality inspired by great ideas of a religious kind. For, in antiquity, the only bond able to hold incongruous elements together in one nationality was religion. With the people whom Moses had to lead the necessity would be the same, or even greater. But the political work which must have preceded any common action likewise demanded a great personality. Though no doubt a common misery might silence jealousies and make men eager to listen to any promises of deliverance, yet many troublesome negotiations must have been carried through successfully before these sentences could have been written with truth: "And Moses and Aaron went and gathered together all the elders of the children of Israel, and the people believed, and bowed their heads and worshipped."
Many conjectures have been hazarded as to what the centre of Moses' message at this time really was. Some, like Stade, bring it down to this, that Yahweh was the God of Israel. Others add to this somewhat meagre statement another equally meagre, that Israel was the people of Yahweh. But unless the character of Yahweh had been previously expounded to the people, there seems little in these two declarations to excite any enthusiasm or to kindle faith. The mere fact of inducing the tribes to put all other gods aside is insufficient to account for any of the results that followed, if to Moses Yahweh had remained simply a tribal God, of the same type as the gods of the Canaanites. On the other hand, if he had risen to the conception of God as a spirit, of Yahweh as the only living God, as the inspirer and defender of moral life, or even if he had made any large approach to these conceptions, it is easy to understand how the hearts of the mass of the people were stirred and filled, even though things so high were not, by the generality, thoroughly understood or long retained. But the hearts of all the chosen, the spiritually elect, would be moved by them as the leaves are moved by the wind. These, with Moses at their head, formed a nucleus which bore the people on through all their trials and dangers, and gradually leavened the mass to some extent with the same spirit.
Even after this had been accomplished, the main work remained to be done. We cannot agree indeed with many writers who seem to think that the whole life of the Israelite people was started anew by Moses. That would involve that every regulation for the most trivial detail of ordinary life was directly revealed, and that Moses made a _tabula rasa_ of their minds, rubbing out all previous laws and customs, and writing a God-given constitution in their place. Obviously, that could hardly be; but still a task very different, yet almost as difficult, remained for Moses after his first success. His final aim was to make a virtually new nation out of the Hebrew tribes; and their whole constitution and habits had, consequently, to be revised from the new religious standpoint. He and the nation alike had inherited a past, and it was no part of his mission to delete that. Reforms, to be stable, must have a root in the habits and thoughts of the people whom they concern. Moses would, consequently, uproot nothing that could be spared; he would plant nothing anew which was already flourishing, and was compatible with the new and dominant ideas he had introduced. A great mass of the laws and customs of the Hebrews must have been good, and suitable to the stage of moral advancement they had reached before Moses came to them. Any measure of civilised life involves so much as that. Another great mass, while lying outside of the religious sphere, must have been at least compatible with Yahwism. All laws and customs coming under these two categories, Moses would naturally adopt as part of the legislation of the new nation, and would stamp them with his approval as being in accord with the religion of Yahweh. They would thus acquire the same authority as if they were entirely new, given for the first time by the Divinely inspired lawgiver.