Pseudo-Chrysostom — as excerpted in the Catena Aurea on Mark 5:1-20

“(Vict. Ant. e Cat. in Marc.) Luke, however, says, into the abyss. (Luke 8:3.) For the abyss is the separation of this world, for devils deserve to be sent into outer darkness, prepared for the devil and his angels. This Christ might have done, but He allowed them to remain in this world, lest the absence of a tempter should deprive men of the crown of victory.”