There was a carpenter who had excellent craftsmanship and a good reputation. He was very popular, but he had a very unruly temper.
After the furniture was finished, he did not paint it, but left it to the craftsmen who specialized in painting. After the door was finished, he did not install the door nails, and left the small work to the small workers who specialized in pressing the door nails.
Once he helped someone to finish a cabinet, but did not install the handle. The other party asked why he did not install it. Isn't it a piece of cake for you?
The carpenter smiled and replied that this was the rule of his ancestors. You can't do everything, and you have to leave some food for others.