Matthew 8:30

(Verse 30, 31.) What have we to do with you, Jesus, Son of God? Have you come here before the time to torment us? Now there was a herd of many pigs feeding not far off from them. And the demons begged him, saying, 'This confession is not of free will, which is followed by the reward of the confessor, but of forced necessity, which compels unwillingly, as if fugitive slaves see their master after a long time: they only beg to be spared from the beatings.'

(De. Cons. Ev. ii. 24.) Though the words of the daemons are variously reported by the three Evangelists, yet this is no difficulty; for they either all convey the same sense, or may be supposed to have been all spoken. Nor again because in Matthew they speak in the plural, in the others in the singular number; because even the other two Evangelists relate that when asked his name, he answered, Legion, showing that the daemons were many. Now there was not far from thence a herd of many swine feeding; and the daemons prayed him, saying, If thou cast us out hence, send us into the swine.

The swine to which the demons fled symbolize the unfaithful and unclean people who, feeding at some distance by the sea, were living according to the sins of the world. Thus the swine showed themselves to be a ready residence for the demons. Living nearby …

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.

This ("substance"), accordingly, he "squandered; "having been cast by his moral habits far from the Lord, amid the errors and allurements and appetites of the world, where, compelled by hunger after truth, he handed himself over to the prince of this age. He set him over "swine," to feed that flock familiar to demons, where he would not be master of a supply of vital food, and at the same time would see others (engaged) in a divine work, having abundance of heavenly bread.