Chapter 40 — Part IV: Prayer — The Sixth Petition: Lead Us Not into Temptation
Section 10. The Apostle entitles the demons princes, on account of the excellence of their nature, since by nature they are superior to man, and to all other visible creatures. He also calls them powers, because they excel not only by their nature, but also by their power. He designates them rulers of the world of darkness, because they rule not the world of light and glory, that is to say, the good and the pious, but the world of gloom and darkness, namely, those who, blinded by the defilement and darkness of a wicked life, are satisfied to have for their leader the devil, the prince of darkness. He also terms the demons the spirits of wickedness, because there is a wickedness of the spirit, as well as of the flesh. What is called the wickedness of the flesh inflames the appetite to lusts and pleasures, which are perceived by the senses; while the wickedness of the spirit are evil purposes and depraved desires, which belong to the superior part of the soul, and which are so much worse than the wickedness of the flesh as mind itself and reason are higher and more excellent (than the senses). The wickedness of Satan the Apostle spoke of as in the high places, because the chief aim of the evil one is to deprive us of our heavenly inheritance.