Luke 8:29

(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.

Mark here the combination of fear with boldness and great desperation, for it is a sign of devilish despair to speak out boldly, What have I to do with thee, Jesus, thou Son of God most high? but of fear when they pray, I beseech thee not to cast me out. But if thou knowest Him to be the Son of God most high, thou confessest Him to be the God of heaven and earth, and of all things that are contained in them. How then dost thou make use not of thy own but His words, saying, What have I to do with thee? But what earthly prince will altogether endure to have his subjects tormented by barbarians? Hence it follows, For he had commanded the unclean spirit to come out of him. And He shows the necessity of the command, adding, For oftentimes it had caught him, &c. And hence it is plain that the rebel hosts against the Divine Majesty were thrust down to hell by the unspeakable power of the Saviour.