Matthew 8:32

The dæmons seeing that there is no longer any place left for them among the Gentiles, pray that they may be suffered to dwell among the heretics; these, seized by them, are drowned in the sea, that is, in worldly desires, by the instigations of the dæmons, and perish in the unbelief of the rest of the Gentiles.

(Verse 32, 33.) If you cast us out, send us into the herd of pigs. And He said to them: Go. And they, going out, went into the pigs. And behold, the whole herd rushed headlong into the sea, and they died in the water. But the shepherds fled; and coming into the city, they announced all these things, and about those who had demons. Not that the Savior granted the demons what they were asking, He said, go: but so that through the destruction of the pigs, an opportunity for salvation would be given to the people. For when the shepherds see these things, they immediately report them to the city. Let Manichaeus be ashamed, if the souls of men and beasts are of the same substance and from the same author, how is it that for the salvation of one man, two thousand pigs are choked?

Now, should any one say, "And wherefore did Christ fulfill the devils' request, suffering them to depart into the herd of swine?" this would be our reply, that He did so, not as yielding to them, but as providing for many objects thereby. One, to teach them that are delivered from those wicked tyrants, how great the malice of their insidious enemies; another, that all might learn, how not even against swine are they bold, except He allow them; a third, that they would have treated those men more grievously than the swine, unless even in their calamity they had enjoyed much of God's providential care. For that they hate us more than the brutes is surely evident to every man. So then they that spared not the swine, but in one moment of time cast them all down the precipice, much more would they have done so to the men whom they possessed, leading them towards the desert, and carrying them away, unless even in their very tyranny the guardian care of God had abounded, to curb and check the excess of their violence. Whence it is manifest that there is no one, who doth not enjoy the benefit of God's providence. And if not all alike, nor after one manner, this is itself a very great instance of providence; in that according to each man's profit, the work also of providence is displayed. And besides what hath been mentioned, there is another thing also, which we learn from this; that His providence is not only over all in common, but also over each in particular; which He also declared with respect to His disciples, saying, "But the very hairs of your head are numbered." And from these demoniacs too, one may clearly perceive this; who would have been choked long before, if they had not enjoyed the benefit of much tender care from above.

Now, should any one say, "And wherefore did Christ fulfill the devils' request, suffering them to depart into the herd of swine?" this would be our reply, that He did so, not as yielding to them, but as providing for many objects thereby. One, to teach them that are delivered from those wicked tyrants, how great the malice of their insidious enemies; another, that all might learn, how not even against swine are they bold, except He allow them; a third, that they would have treated those men more grievously than the swine, unless even in their calamity they had enjoyed much of God's providential care. For that they hate us more than the brutes is surely evident to every man. So then they that spared not the swine, but in one moment of time cast them all down the precipice, much more would they have done so to the men whom they possessed, leading them towards the desert, and carrying them away, unless even in their very tyranny the guardian care of God had abounded, to curb and check the excess of their violence. Whence it is manifest that there is no one, who doth not enjoy the benefit of God's providence. […]

But for what intent did the devils destroy the swine? Everywhere they have labored to drive men to dismay, and everywhere they rejoice in destruction. This, for instance, the devil did with respect to Job, although in that case too God suffered it, but neither in that case as complying with the devil, but willing to show His own servant the more glorious, cutting off from the evil spirit all pretext for his shamelessness, and turning on his own head what was done against the righteous man. Because now also the contrary of what they wished came to pass. For the power of Christ was gloriously proclaimed, and the wickedness of the demons, from which He delivered those possessed by them, was more plainly indicated; and how they want power to touch even swine, without permission from the God of all. And if any would take these things in a hidden sense, there is nothing to hinder. For the history indeed is this, but we are to know assuredly, that the swinish sort of men are especially liable to the operations of the demons. And as long as they are men that suffer such things, they are often able yet to prevail; but if they are become altogether swine, they are not only possessed, but are also cast down the precipice. And besides, lest any should suppose what was done to be mere acting, instead of distinctly believing that the devils were gone out; by the death of the swine this is rendered manifest.