Once upon a time, there was an old man living in a small town by himself. He was blind, so he couldn't see anything. However, he always carried a lighted lamp (亮着的灯) with him when he went out at night.
One night when he was coming home after having dinner outside, he met a group of young men. They saw that he was blind, but carrying a lighted lamp. They thought it was so funny and started to make fun of (嘲笑) him. One of them asked him, "Hey, man! You are blind and can't see anything! Why do you carry the lamp then?"
The blind man said, "Yes, it's true that I can't see anything and don't need the lamp. However, it's for people like you who can see. When I'm carrying the lamp at night, people can see me so that they won't push me accidentally (意外地). That is why I carry the lighted lamp."
The young men felt ashamed (感到羞耻的) to judge (判断) the old man without thinking. They felt sorry and apologized to the old man.