Catena Aurea on Matthew 5:43–48: Augustine of Hippo

That by the command, “Thou shalt love thy neighbour,” all mankind were intended, the Lord shewed in the parable of the man who was left half dead, which teaches us that our neighbour is every one who may happen at any time to stand in need of our offices of mercy; and this who does not see must be denied to none, when the Lord says, “Do good to them that hate you.”