Pseudo-Chrysostom — as excerpted in the Catena Aurea on Matthew 5:38-42

“Christ bids us lend but not on usury; for he who gives on such terms does not bestow his own, but takes of another; he looses from one chain to bind with many, and gives not for God’s righteousness sake, but for his own gain. For money taken on usury is like the bite of an asp; as the asp’s poison secretly consumes the limbs, so usury turns all our possessions into debt.”