Luke 8:30

(Hom. 14. in Cantic.) Certain evil spirits imitating the heavenly hosts and the legions of Angels say that they are legions. As also their prince says that he will exalt his throne above the stars that he may be like to the Most High. (Isaiah 14:13.)

He enquires not his name as ignorant of it, but that when the demoniac had confessed the plague which he endured, the power of the Healer might shine forth more welcome to him. But the priests also of our time, who through the grace of exorcism are able to cast out devils, are wont to say that the sufferers can no otherwise be cured than by openly telling in confession every thing which either waking or sleeping they have endured from the unclean spirits, and above all when they imagine that the devils seek and obtain the possession of the human body. So also here the confession is added, And he said, Legion, because many devils were entered into him.

(ubi sup.) Now that he was bound by brazen fetters and chains, signifies the harsh and severe laws of the Gentiles, by which also in their states offences are restrained. But, that having burst these chains he was driven by the evil spirit into the wilderness, means that having broken through these laws, he was also led by lust to those crimes which exceeded the ordinary life of men. By the expression that there was in him a legion of devils, the nations are signified who served many devils. But the fact that the devils were permitted to go into the swine, which fed on the mountains, signifies also the unclean and proud men over whom the evil spirits have dominion, because of their worship of idols. For the swine are they who, after the manner of unclean animals without speech and reason, have defiled the grace of their natural virtues by the filthy actions of their life.