And there was a good way off from them a herd of many swine feeding.
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Chromatius of Aquileia
AD 407
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 this worldly sea they are steeped in error and inordinate desire. This made it easy for them to be overcome by the demons.
And not far from them. In all Greek copies at present we read, There was afar off. Beza himself here owns, that the Latin Vulgate is to be preferred before all Greek copies and manuscripts. (Witham)
The Greco-Latin manuscript of Cambridge has not the word non in the Latin; but in the Latin of the ancient Vulgate it occurs. (Bible de Vence)
The demons asked this so that they could drown the swine, and thus the owners would be grieved and would not welcome Christ. Christ granted the demons their request in order to show how great is their bitterness towards men, and that if they had the power, and were not prevented as they are by God, they would do worse things to us than they did to the swine. For God protects those possessed by demons so that they do not kill themselves.