Ding Limei's life is Thanksgiving. What's the theme?

Ding Limei's life is a life of gratitude, the main idea of which is that gratitude is a civilization and gratitude is a virtue and responsibility. With gratitude, people, people and nature, people and society will become more harmonious and friendly. Gratitude should be the basic moral standard that everyone in society should have, the minimum accomplishment of being a man, and also the human nature.