John Chrysostom — as excerpted in the Catena Aurea on Matthew 12:43-45

“Or, herein He may be shewing forth their punishment. As when dæmoniacs have been loosed from their infirmity, if they after become remiss, they draw upon themselves more grievous illusions, so shall it be among you—before ye were possessed by a dæmons, when you worshipped idols, and slew your sons to dæmon yet I forsook you not, but cast out that dæmon by the Prophets, and afterwards came Myself seeking to purify you altogether. Since then ye would not hearken to me, but have fallen into more heinous crime, (as it is greater wickedness to slay Christ than to slay the Prophets,) therefore ye shall suffer more heavy calamities. For what befel them under Vespasian and Titus, were much more grievous than they had suffered in Egypt, in Babylon, and under Antiochus. And this indeed is not all He shews concerning them, but also that since they were destitute of every virtue, they were more fit for the habitation of dæmons than before. It is reasonable to suppose that these things were said not to them only, but also to us. If after being enlightened and delivered from our former evils, we are again possessed by the same wickedness, the punishment of these latter sins will be greater than of the first; as Christ spake to the paralytic, Behold, thou art made whole, sin not, lest a worse thing come upon thee. (John 5:14)”