that the ordained relation of the two powers was the subordination of the temporal to the spiritual authority. This view was maintained by such texts of Scripture as these: " But he that is spiritual judgeth all things, yet he himself is judged of no man; "[1] " See, I have this day set thee over the nations and over the kingdoms, to root out and to pull down, and to destroy and to throw down, to build and to plant."[2] The conception was further illustrated by such comparisons as the following. As God has set in the heavens two lights, the sun and the moon, so has he established on earth two powers, the spiritual and the temporal; but as the moon is inferior to the sun and receives its light from it, so is the Emperor inferior to the Pope and receives all power from him. Again, the two authorities were likened to the soul and body; as the former rules over the latter, so is it ordered that the spiritual power shall rule over and subject the temporal.
The first theory was the impracticable dream of lofty souls who forgot that men are human. Christendom was virtually divided into two hostile camps, the members of which were respectively supporters of the Imperial and the Papal theory. The most interesting and instructive chapters of mediæval history after the tenth century are those that record the struggles between Pope and Emperor, springing from their efforts to reduce to practice these irreconcilable theories.[3]
