Once upon a time there was a poor farmer in China. He had to work very hard and support his family with a little land he had. He had a boy and a girl, wife and his old father. His father was very weak and old and could work and sat idle.
He thought that his father is only a burden and eating on his hard earned income. He is destroying his properties for vein.
One day he did not go to his field and built a cart of the wood he had. The next day he told his father to sit on the cart and began to pull it to the top of the nearby hill.
When they got the top most place of the hill, the farmer positioned the cart to push it towards bottom. In the meantime the old father told the man, “please save the cart atleast, because one day your son will need it”.