Mark 5:3

(Vict. Ant. e Cat. in Marc. et v. Chrys. Hom. in Matt. 28) Or else, Mark and Luke relate what was most worthy of compassion, and for this reason they put down more at length what had happened to this man; for there follows, no man could bind him, no, not with chains. They therefore simply said, a man possessed of a devil, without taking heed to the number; or else, that he might show the greater virtue in the Worker; for He who had cured one such, might cure many others. Nor is there any discrepancy shown here, for they did not say that there was one alone, for then they would have contradicted Matthew. Now devils dwelt in tombs, wishing to convey a false opinion to many, that the souls of the dead were changed to devils.

(ubi sup.) Who dwelt in the tombs, because they delighted in dead works, that is, in sins; who were ever raging night and day, because whether in prosperity or in adversity, they were never free from the service of malignant spirits: again, by the foulness of their works, they lay as it were in the tombs, in their lofty pride, they wandered over the mountains, by words of most hardened infidelity, they as it were cut themselves with stones. But he said, My name is Legion, because the Gentile people were enslaved to divers idolatrous forms of worship. Again, that the unclean spirits going out from man enter into swine, which they cast headlong into the sea, implies that now that the people of the Gentiles are freed from the empire of demons, they who have not chosen to believe in Christ, work sacrilegious rites in hidden places.

Here again the demoniac is the people of the Gentiles, in a most hopeless case, bound neither by the law of nature, nor of God, nor by human fear. Or they are choked in hell without any touch of mercy by the rushing on of an early death; which evils many persons thus avoid, for by the scourging of the fool, the wise is made more prudent.