Luke 17:17 (ESV)

17 Then Jesus answered, “Were not ten cleansed? Where are the nine?

From these questions it shows that Jesus is deeply disappointed. He knows—and in this his godly power is revealed—that all ten of the men were healed. And now of those ten, only one man comes before him. How is this possible? He finds it shocking that none of the other nine made the effort to thank him for their healing.