Theophylact of Ohrid
Catena Aurea · Lukasevangelium 17
And it came to pass, as he went to Jerusalem, that he passed through the midst of Samaria and Galilee. And as he entered into a certain village, there met him ten men that were lepers, which stood afar off: And they lifted up their voices, and said, Jesus, Master, have mercy on us. And when he saw them, he said unto them, Go shew yourselves unto the priests. And it came to pass, that, as they went, they were cleansed. And one of them, when he saw that he was healed, turned back, and with a loud voice glorified God, And fell down on his face at his feet, giving him thanks: and he was a Samaritan. And Jesus answering said, Were there not ten cleansed? but where are the nine? There are not found that returned to give glory to God, save this stranger. And he said unto him, Arise, go thy way: thy faith hath made thee whole. It follows, And he was a Samaritan.
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?