made "before the foundation of the world," yet which has to be made again in every human life. The work of the first three centuries was to give to this idea such logical expression as was then possible, in the doctrines of the Incarnation and the Trinity. It is true that this idea of the unity of man with God was not immediately carried out to any of the consequences which might seem to be contained in it. It remained for a time a religion, and a religion only; it did not show itself to be the principle of a new social or political order of life. Rather it accepted the old order represented by the Roman Empire, and even consecrated it as "ordained of God," only demanding for itself that it should be allowed to purify the inner life of men. Such a separation of the things of Cæsar and the things of God was then inevitable; for it is impossible that a new principle can ever be received simply and without alloy into minds, which are at the same time occupying themselves with its utmost practical or even theoretical consequences. In this sense there is great truth in what Comte says about the value of the separation of the spiritual from the temporal authority. The power of directly realizing a new religious principle, just because it draws away attention from the principle itself to the details of its practical application, is likely to prevent that application being either effective or even a true expression of the principle. Such practical inferences cannot safely be drawn by direct logical deduction; they will be made with certainty and effect only by spirits which the principle has remoulded. The decided withdrawal of the Christian Church from the sphere of "practical politics" was, therefore, not merely a necessity forced upon it from without; it was a condition which its best members gladly accepted, because without it the inner transformation of man's life by the new doctrine would have been impossible. If Christianity had raised an insurrection of slaves, it never could have put an end to slavery.