Isaiah 59:18

18.As if on account of recompenses. He confirms the statement of the preceding verse; for he shows what will be the nature of that vengeance with which he had clothed the Lord; namely, that he is prepared to render recompense to his enemies. We must attend to the reason why the Prophet describes the Lord as thus armed, indignant, and ready for vengeance. It is, because the salvation of the Church is connected with the destruction of the wicked; and therefore God must be armed against the enemies who wish to destroy us.

Hence we see God’s infinite love toward us, who loves us so ardently that he bears hostility to our enemies, and declares that he will render recompense to them. So strong is his affection to his little flock, that he sets a higher value on them than on the whole world. This is the reason why he says that he will render recompense to the islands, that is, to countries beyond the sea and far off; for, in order to deliver his people, he overthrew monarchies that were powerful, and that appeared to be invincible. But, although here he mentions none but mortal men, still we must begin with Satan, who is their head.