Maximus the Confessor

Now the Lord ordains for each class of sinners an appropriate punishment. The fire of Hell unquenchable for fleshly burnings, gnashing of teeth for wanton mirth, intolerable thirst for pleasure and revelry, the worm that dieth not for a crooked and malignant heart, everlasting darkness for ignorance and deceit, the bottomless pit for pride. Hence the deep is assigned to the devils as unto the proud, it follows, And there was there an herd of swine, &c.

Catena Aurea by Aquinas ↗

Bede

And they begged him not to order them to go into the abyss. The demons knew that eventually, through the advent of the Lord, they would be sent into the abyss, not by foretelling the future themselves, but by recalling the words of the prophets spoken about them, and thus they thought that the Lord's advent, whose glory they marveled at, would tend to their own destruction.

On the Gospel of Luke ↗

Bonaventure

And they besought him etc. After the violence of the besieging demon, the Evangelist here subjoins the omnipotence of the Lord who liberates. Now in this part Christ is shown to be powerful in every way, namely powerful in commanding, powerful in permitting, powerful in saving, and powerful in destroying. …

Commentary on Luke, Chapter 8 ↗