Whether by God's mercy all punishment of the damned, both men and demons, comes to an end?

Objections

Objection 1 : It would seem that by God's mercy all punishment of the damned, both men and demons, comes to an end. For it is written (Wis. 11:24): "Thou hast mercy upon all, O Lord, because Thou canst do all things." But among all things the demons also are included, since they are God's creatures. Therefore also their punishment will come to an end.
Objection 2 : Further, "God hath concluded all in sin [Vulg.: 'unbelief'], that He may have mercy on all" (Rm. 11:32). Now God has concluded the demons under sin, that is to say, He permitted them to be concluded. Therefore it would seem that in time He has mercy even on the demons.
Objection 3 : Further, as Anselm says (Cur Deus Homo ii), "it is not just that God should permit the utter loss of a creature which He made for happiness." Therefore, since every rational creature was created for happiness, it would seem unjust for it to be allowed to perish altogether.