A concrete knowledge of the multiplicity of cults, then, was obtruded on the leisured and travelled men of the early empires and of such a civilization as that of Hellas; [122] and when to such knowledge there was added a scientific astronomy (the earliest to be constituted of the concrete sciences), a revision of beliefs by such men was inevitable. [123] It might take the form either of a guarded skepticism or of a monarchic theology, answering to the organization of the actual earthly empire; and the latter view, in the nature of the case, would much the more easily gain ground. The freethought of early civilization, then, would be practically limited for a long time to movements in the direction of co-ordinating polytheism, to the end of setting up a supreme though not a sole deity; the chief God in any given case being apt to be the God specially affected by the reigning monarch. Allocation of spheres of influence to the principal deities would be the working minimum of plausible adjustment, since only in some such way could the established principle of the regularity of the heavens be formally accommodated to the current worship; and wherever there was monarchy, even if the monarch were polytheistic, there was a lead to gradation among the Gods. [124] A pantheistic conception would be the highest stretch of rationalism that could have any vogue even among the educated class. All the while every advance was liable to the ill-fortune of overthrow or arrest at the hands of an invading barbarism, which even in adopting the system of an established priesthood would be more likely to stiffen than to develop it. Early rationalism, in short, would share in the fluctuations of early civilization; and achievements of thought would repeatedly be swept away, even as were the achievements of the constructive arts. § 2. THE PROCESS IN INDIA