In the New Testament, when the ten lepers called out to Christ, they were instructed to go show themselves to the priest.
As they went about doing the thing they were told to do, they were healed. But only one turned back and cried with a load voice praising God. Christ reflects on how only one had truly acted in a manner that was in the spirit of true worship and gratitude.
The other nine are doing a good thing, they recognized the Savior and displayed enough faith to be healed, and were going and doing the very thing Christ told them to do.
But more important to the Savior than what we do, is who we become. The one, a Samaritan no less, became something more that day. He went from obedient leper to whole disciple because he allowed gratitude and humility to stop and turn him back to the Savior.
As was taught to Joseph Smith,
“And in nothing doth man offend God, or against none is his wrath kindled, save those who confess not his hand in all things, and obey not his commandments.” (Doctrine and Covenants, Doctrine and Covenants, Section 59)
Who knew gratitude was so very becoming of us?