In 1921, Dr. Albert Shelton wrote an account of his service as a missionary in Tibet. Walking along the road one day, he met an old couple. When they saw him, they got down on the side of the road and began bumping their heads on the ground as a sign of humility. Shelton told them to get up, that he did not allow anyone to bow before him. Then they brought him an old rooster, a dirty piece of butter and six eggs and reminded the doctor their son had been severely injured in an accident. The doctor had operated on him and saved his life. They had come to thank him. They had walked five days just to say, "Thank you."