Once, there was a mule. He used to draw a chariot. One day, the mule was pulling the chariot as usual. But he was very tired and was pulling the chariot slowly. While he was pulling the chariot, a fly came and sat on the wheel of the chariot. She said to the mule, “Why do you pull the chariot so slowly? If you do not pull it faster, I will sting you on the neck.” The mule retorted, “I am not scared of your threat. I only care about the person who is sitting above me. I follow his command. If I walk slowly, he can increase or decrease my speed. So, off you go. I do not want to talk to someone who is rude to me, for I know when I have to walk fast and when I have to walk slowly.”