In all this God, who cannot be at variance with Himself, made the two Powers to help each other, conferring upon each distinct offices, which concern respectively the natural and the supernatural life of man, but likewise subordinating the natural to the supernatural end in the person and race of the Second Adam, as He had subordinated it in the person of the First Adam. One of the greatest saints and rulers, who shines in the firmament of the Church with almost unparalleled lustre, has expressed this union under the image of a human body, seeing the natural light by two eyes, but directed by one mind, the mind of Christ. He is the one Head of the two Powers, ruling in temporal sovereignty by the hand of kings, in spiritual by the Priesthood which He has inaugurated. If we imagine the one mind of the God-man thus ruling the Christendom which He has made out of Himself by the two eyes of the kingdom and the priesthood, we reach the divine ideal of the relation between the two Powers. Thus St. Gregory VII. observes in his letter to Rodolph, Duke of Suabia, A.D. 1073:[28] "The sovereign reigns most gloriously, and the Church's vigour is strengthened, when priesthood and empire are joined in the unity of concord. There should be no fiction, no dross, in that concord. Let us then confer together, for as the human body is directed in the natural light by two eyes, so when these two dignities are united in the harmony of pure religion, the body of the Church is shown to be ruled and enlightened with spiritual light. Let us give our best attention to these matters, so that when you have well entered into what is our wish, if you approve of our reasons as just, you may agree with us. But if you would add or subtract anything from the line of conduct which we have marked out, we shall be ready, if God permit, to consent to your counsels." The words "if God permit" indicate very gently that subordination, grounded upon the pre-eminence of the divine law, and the divine Ruler who upbears it, which, in case of difference, the natural must yield to the supernatural authority. There is the fullest recognition that to temporal sovereignty all things belong which concern natural right. In these few words I think that St. Gregory VII. has summed up the settled view, policy, and practice of all his predecessors and of all his successors upon the relation between the two Powers, and the importance of their agreement for the good of human society. Never has any one of them denied to human sovereignty the exercise of all those rights which belong to natural law. Never has any one of them failed to maintain that all things which belong to natural law are subordinate to those things which touch the salvation of man, and accordingly that when the two orders of things come into conflict, the natural must yield to the supernatural. It is obvious to add how many mixed things there must be, which enter into