A poor father and son once lived in a remote mountain village.

Later, my son finally grew up. One day, he told his father that he wanted to go out and make a living. Although the old father was reluctant to part with his son, he knew that he could not change his son's decision, so he agreed with tears. The next day, the son carried his luggage and left the village where he had lived for decades. The father did not go to see his son off because he could no longer bear to look at his son's back with tears streaming down his face.

The son walked for a long time and came to a mine. The mine owner said to him: "I am short of manpower here. You stay here to work. I will take care of food and housing for you, and every year you work, you can get out of the mine." Choose a piece of ore. The ore may contain priceless jade, or it may just be an ordinary stone. Think about it." He thought: His father has never seen jade in his life. If he saw jade after polishing off the sand skin on the ore, It will definitely be a pleasure. So, he stayed.