"One of them, when he saw he was healed, came back, praising God in a loud voice. He threw himself at Jesus’ feet and thanked him—and he was a Samaritan. Jesus asked, “Were not all ten cleansed? Where are the other nine? Was no one found to return and give praise to God except this foreigner?”" - Luke 17:15-18
Jesus was disappointed when only one out of ten returned to give praise to God for their healing. Furthermore, the one who returned wasn't even taught in the Scriptures; he was a Samaritan! It doesn't take a wealth of Bible knowledge to know how to say thanks to God for his goodness. As the years have passed, the Church has fine-tuned worship and praise services. Certainly more than one out of ten will return to give thanks to God this week, but sadly... very few ever get a "ten".
Readings: OT Year 3 - 2 Kings 19:14-19 / NT - Luke 18:1-17