The first four commandments show that Yahweh was already conceived as a spiritual being, removed by a whole heaven from the gods of the Canaanite nations by whom Israel was surrounded. These were mere representatives of the powers of nature. As such they were regarded as existing in pairs, each god having his female counterpart; and their acts had all the indifference to moral considerations which nature in its processes shows. They dwelt in mountain tops, in trees, in rude stones, or in obelisks, and they were worshipped by rites so sanguinary and licentious that Canaanite worship bore everywhere a darker stain than even nature-worship elsewhere had disclosed. In contrast to all this the Yahweh of the Decalogue is "alone," in solitary and unapproachable separation. Amid all the unbridled speculation that has been let loose on this subject, no one, I think, has ever ventured to join with Him any name of a goddess, and He sternly repudiates the worship of any other god besides Him. Now, though there is nothing said of monotheism here, _i.e._ of the doctrine that no god but one exists, yet, in contrast to the hospitality which distinguished and distinguishes nature-worship in all its forms, Yahweh here claims from His people worship of the most exclusive kind. Besides Him they were to have no object of worship. He, in His unapproachable separateness, had alone a claim upon their reverence. Further, in contrast to the gods who dwelt in trees and stones and pillars, and who could be represented by symbols of that kind, Yahweh sternly forbade the making of any image to represent Him. Thereby He declared Himself spiritual, in so far as He claimed that no visible thing could adequately represent Him. In contrast to the ethnic religions in general, even that of Zarathushtra, the noblest of all, where only the natural element of fire was taken to be the god or his symbol, this fundamental command asserts the supersensuous nature of the Deity, thereby rising at one step clear above all naturalism.
So great is the step indeed, that Kuenen and others, who cannot escape the evidence for the antiquity of the other commandments, insist that this at least cannot be pre-prophetic, since we have such numerous proofs of the worship of Yahweh by images, down at least to the time of Josiah's reform. But, by all but Stade, it is admitted that there was at Shiloh under Eli, and at Jerusalem under David and Solomon, no visible representation of Deity. Now the same writers who tell us this everywhere represent the worship of Yahweh by images as existing among the people. According to their view, the nation had a continual and hereditary tendency to slip into image-worship, or to maintain it as pre-Mosaic custom. And it is quite certain that up even to the Captivity, and after, when, according to even the very boldest negative view, this command had been long known, image-worship, not only of Yahweh, but also of false gods and of the host of heaven, was largely prevalent. Only the Captivity, with its hardships and trials, brought Israel to see that image-worship was incompatible with any true belief in Yahweh. Undeniably, therefore, the existence of an authoritative prohibition does not necessarily produce obedience; and the Biblical view that the Decalogue is Israel's earliest law proves to be the more reasonable, as well as the better authenticated of the two. If, after the command beyond all doubt existed in Israel, it needed the calamities of Israel's last days, and the hardships and griefs of the Exile, to get it completely observed, and if in Jerusalem and at Shiloh in the pre-prophetic time Yahweh was worshipped without images, there can hardly be a doubt that this command must have existed in the earliest period. For no religion is to be judged by the actual practice of the multitude. The true criterion is its highest point; and the imageless worship of Jerusalem is much more difficult to understand if the second commandment was not acknowledged previously in Israel, than it would be if the Decalogue, essentially as we now have it, was acknowledged in the days before the kingship at least.[25]