He made a way to his anger; he spared not their soul from death, but gave their life over to the pestilence;
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Augustine of Hippo
28. But as far as regardeth the present passage of this Psalm, if we dare not ascribe those things which were marvellously formed out of creatures, to evil angels; we have a thing which without doubt we can ascribe to them; the dyings of the beasts, the dyings of the first-born, and this especially whence all these things proceeded, namely, the hardening of heart, so that they would not let go the people of God. For when God is said to make this most iniquitous and malignant obstinacy, He maketh it not by suggesting and inspiring, but by forsaking, so that they work in the sons of unbelief that which God doth duly and justly permit. ...Moreover, those evil manners which we said were signified by these corporal plagues, on account of that which was said before, "I will open in parables my mouth," are most appropriately believed by means of evil angels to have been wrought in those that are made subject to them by Divine justice. For neither when that cometh to pass of which the apostle speaketh, "God gave them over into the lusts of their heart, that they should do things which are not convenient," can it be but that those evil angels dwell and rejoice therein, as in the matter of their own work: unto whom most justly is human haughtiness made subject, in all save those whom grace doth deliver. "And for these things who is sufficient?" Whence when he had said, "He sent unto them the anger of His indignation, indignation and anger and tribulation, an infliction through evil angels;" for this which he hath added, "a way He hath made for the path of His anger" (ver. 50), whose eye, I pray, is sufficient to penetrate, so that it may understand and take in the sense lying hidden in so great a profundity? For the path of the anger of God was that whereby He punished the ungodliness of the Egyptians with hidden justice: but for that same path He made a way, so that drawing them forth as it were from secret places by means of evil angels unto manifest offences, He most evidently inflicted punishment upon those that were most evidently ungodly. From this power of evil angels nothing doth deliver man but the grace of God, whereof the Apostle speaketh, "Who hath delivered us from the power of darkness, and l hath translated us into the kingdom of the Sonof His love:" of which things that people didbear the figure, when they were delivered fromthe power of the Egyptians, and translated into the kingdom of the land of promise flowing with milk and honey, which doth signify the sweetness of grace.