Having met the Savior, therefore, the lepers earnestly besought Him to free them from their misery, and called Him Master, that is. Teacher. No one pitied them when suffering this malady, but He Who had appeared on earth for this very reason, and had become man that He might show pity to all, He was moved with compassion for them, and had mercy on them.
-St. Cyril of Alexandria, Commentary on the Gospel of St. Luke, Homilies 113-116. B#42, pp. 465-466, 4th Century


The nine then, as being Jews, falling into a thankless forgetfullness, did not return to give glory to God; by which He shows that Israel was hard of heart, and utterly unthankful: but the stranger … returned with a loud voice to glorify God. It shows, therefore, that the Samaritans were grateful, but that the Jews, even when benefitted, were ungrateful.
-St. Cyril of Alexandria, Commentary on the Gospel of St. Luke, Homilies 113-116. B#42, pp. 465-466, 4th Century