We are thus necessarily brought to the third and last solution. Since the conciliation between the positive mode of thought and the other one is impossible; since the exclusive ascendency of the theologico-metaphysical mode of thought is out of the question; since when all is said the human mind needs a philosophy, it follows that that philosophy can only proceed from the positive mode of thought itself. There is nothing, _a priori_, to prevent this solution from being realised. For the last positions of the theologico-metaphysical spirit are surely not impregnable. This spirit, “fictitious” in its essence, never could become “real.” The positive spirit is only accidentally “special.” It is quite capable of acquiring the universality which it lacks. The new philosophy would then be founded, and the problem of _perfect logical coherence_ would be solved. The whole difficulty thus appears to be in “universalising” the positive mode of thought. To do this it must be extended to those phenomena which are still habitually conceived according to the theologico-metaphysical mode, that is to say, to the moral and social phenomena. This will be Comte’s crowning discovery. He will found “social physics.” By so doing he will take from theology and metaphysics the last reason of their existence. He will make possible the transition from a positive science to an equally positive philosophy. Thus will be realised “the unity of the understanding,” and this mental harmony will carry with it as its consequence the moral and religious harmony of humanity. FOOTNOTES: [9] cf. infra. book iii. ch. v. p. CHAPTER II THE LAW OF THE THREE STATES In Comte’s system the constitution of sociology may be considered at the same time as a terminus and as a starting point. One sees the positive method attaining with it to the order of the highest, the most “noble,” the most complicated phenomena: in this sense sociology is the term reached by the positive spirit in its ascent. It thus reaches the summit of the hierarchy of the sciences, and henceforth rules over them all. On the other hand, positive philosophy, possible from this moment, will make this a starting point for establishing the principles of morality and of polity. “Through the foundation of sociology,” says Comte at the beginning of the _Cours_, “positive philosophy will acquire that universal character which it still lacks, and will thus become qualified to take the place of theological and metaphysical philosophy, whose only real property to-day is this universality,”[10] and at the end of the _Cours_ he concludes: “The creation of sociology endows with fundamental unity the entire system of modern philosophy.”[11]