You can't carve rotten wood, you can also kill dirt and sleep during the day.

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Confucius said, "You can't carve rotten wood, and you can't draw a wall of dirt. What's the use of blaming this person? " Confucius said: "At first, after listening to people's words, I believed in people's behavior;" Now I listen to him and observe people's behavior. I changed the way I observe people here. "Walls can't be surrounded by walls-Confucius