A son took his old father to a restaurant for an evening dinner. His father was very old and weak. So while his father was eating, he always dropped(落下) food on his clothes. Many people in the restaurant watched him in disgust(厌恶地), but his son kept quiet.
After he finished eating, his son quietly took him to the washroom, washing the food and the other dirty things carefully. When they came out, the whole restaurant was watching them in silence. The son paid the waiter for their food and started walking out with his father.
At that time, an old man in the restaurant called out to the son and asked him, "Don't you think you have left something behind？"
"No sir, I haven't," the son replied.
"Yes, you have! You left a lesson for every son and hope for every father," the old man said.
The restaurant went silent. No one said anything.
