What's the moral of the story on the cabbage planting wall?

The story implies that the situation changes at will.

Planting Chinese Cabbage on the High Wall is an allegorical story, which tells readers that the mind is the source of each other, the environment changes at will, and the mind gives birth to everything. The same thing can get different results from different angles, so we must learn to listen to different opinions when dealing with anything in order to get more reasonable results. The answer is for reference only.

Briefly describe the story of "planting cabbage on the high wall": A scholar went to Beijing to catch the exam and dreamed that cabbage was planted on the wall. The fortune-teller said it was a "waste of energy", so the scholar packed his bags and prepared to return home disheartened. Later, I heard the landlord say, "Isn't this' high school'?" The scholar was full of confidence and decided to walk into the examination room, which made him famous.