Gregory the Great — as excerpted in the Catena Aurea on Matthew 5:38-42

“(Mor. xxxi. 13.) There are, who are so far to be endured, as they rob us of our worldly goods; but there are whom we ought to hinder, and that without breaking the law of charity, not only that we may not be robbed of what is ours, but lest they by robbing others destroy themselves. We ought to fear much more for the men who rob us, than to be eager to save the inanimate things they take from us. When peace with our neighbour is banished the heart on the matter of worldly possessions, it is plain that our estate is more loved than our neighbour.”