This requires no return, just gratitude; Don't need money, but need to be grateful!
If a person does not know how to be grateful, he or she should not be helped!
2. Gratitude is a virtue and obligation of human beings.
If we learn to be grateful, we can be grateful for the mountains and rivers, the sun, the moon and the stars.
4. Only by learning to be grateful can we be grateful to the society and to those who deserve our return and have paid for us!