I am always impressed with the litany-like phrases Martin Luther uses in The Small Catechism as petition by petition he explains the Lord's Prayer:
To be sure, God's name is holy itself ...To be sure, the kingdom of God comes of itself, without our prayers ...To be sure, the good and gracious will of God is done without our prayer ...To be sure, God provides daily bread, even to the wicked, without our prayer...
To be sure, to be sure, to be sure! God's gifts come to us despite our unfaithfulness and often without our prayers. Paul quotes an ancient Christian hymn in his second letter to Timothy: "If we are faithless, he remains faithful - for he cannot deny himself (2 Timothy 2:13)." Our faithlessness and ingratitude cannot make of God something that he is not. To be sure!
All of which brings us to the heart of today's gospel. Rudolph Bultmann is quite correct when he notes that the emphasis of Luke's story is not the miracle of 10 lepers cleansed, but rather the contrast of gratitude and ingratitude depicted on the same dramatic canvas.
Luke draws the contrast all the more boldly when he notes that the man returning to give thanks was a Samaritan, a "foreigner." Always the master storyteller among the four evangelists, Luke, having already given us the story of the "Good Samaritan," now gives us the story of the "Thankful Samaritan."