In a house, there was a cat whose nature was to sleep all the time. Although the owner loved him very much, he was very annoyed with one task—the cat never wanted to catch mice. Even when the house was full of mice, he would lie down lazily with his eyes closed. The owner would say over and over again, “Your job is to catch mice,” but the cat seemed to listen to nothing. One day, the owner got angry and reduced the food. Then the cat realized that just being lazy would not do. Gradually, he understood his responsibility and started catching mice. This incident teaches us—laziness brings harm in life.