One of them fell to the ground at Jesus' feet, thnking him for what he had done - Luke 17:14
Sometimes expressing gratitude means going out of your way to let the party know how thankful you feel
Out of ten men healed with leparosy, only one thanked him
Ten men asked for and received help, only one man was changed for good and received a greater gift - greatful heart
Jesus asked where the other nine went - Luke 17:17