But, as advances were made, it was recognized that creation, in its various parts, displays intention and design, the adaptation of means to secure proposed ends. This suggested a reasoning and voluntary agency, like that of man, in the government of the world; and from a continual reference to human habits and acts, Greek philosophy passed through its stage of anthropoid conceptions. A little farther progress awakened suspicions that the mind of man can obtain no certain knowledge; and the opinion at last prevailed that we have no trustworthy criterion of truth. In the scepticism thus setting in, the approach to Oriental ideas is each successive instant more and more distinct. [Sidenote: Approach to Oriental ideas.] This period of doubt was the immediate forerunner of more correct cosmical opinions. The heliocentric mechanism of the planetary system was introduced, the earth deposed to a subordinate position. The doctrines, both physical and intellectual, founded on geocentric ideas, were necessarily endangered, and, since these had connected themselves with the prevailing religious views, and were represented by important material interests, the public began to practise persecution and the philosophers hypocrisy. Pantheistic notions of the nature of the world became more distinct, and, as their necessary consequence, the doctrines of Emanation, Transmigration, and Absorption were entertained. From this it is but a step to the suspicion that matter, motion, and time are phantasms of the imagination--opinions embodied in the atomic theory, which asserts that atoms and space alone exist; and which became more refined when it recognized that atoms are only mathematical points; and still more so when it considered them as mere centres of force. The brink of Buddhism was here approached. As must necessarily ever be the case where men are coexisting in different psychical stages of advance, some having made a less, some a greater intellectual progress, all these views which we have described successively, were at last contemporaneously entertained. At this point commenced the action of the Sophists, who, by setting the doctrines of one school in opposition to those of another, and representing them all as of equal value, occasioned the destruction of them all, and the philosophy founded on physical speculation came to an end. [Sidenote: Uniformity in the manner of intellectual progress.] Of this phase of Greek intellectual life, if we compare the beginning with the close, we cannot fail to observe how great is the improvement. The thoughts dealt with at the later period are intrinsically of a higher order than those at the outset. From the puerilities and errors with which we have thus been occupied, we learn that there is a definite mode of progress for the mind of man; from the history of later times we shall find that it is ever in the same direction. CHAPTER V. THE GREEK AGE OF FAITH. RISE AND DECLINE OF ETHICAL PHILOSOPHY.