This piece depicts the story of a man that wants to be left alone to read his books. He tells his parrot "If anyone comes, tell them that I am not here".
Unfortunately the bird simply repeats "If anyone comes, tell them that I am not here" when people come to the door and so the man's secret is revealed.
The story is actually an old and famous Chinese Joke. But is can also be used as daily advice, not give away your secrets to those whom you can not trust.