Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 17:11-19

“We may gather from this that a man is not one whit hindered from pleasing God because he comes from a cursed race, only let him bear in his heart an honest purpose. Further, let not him that is born of saints boast himself, for the nine who were Israelites were ungrateful; and hence it follows, And Jesus answering him said, Were there not ten cleansed?”