"An astronomer used to go out and observe the stars every night. One day, he went to the suburbs to observe the sky attentively and accidentally fell into a well. He shouted. When people nearby heard the call, they came to know the situation and said to him,' Hey, friend, you look at things in the sky with your heart, not things on the ground.'
"This story is that people must do the most common things on earth before they can talk about profound things in the sky."