What does it mean to listen to the river and make great progress in books?

Huai Su listens to the water of Jialing River at night. He has made great progress in cursive writing. Why? Because Jialing River is endless and continuous, it is linked with the freedom and happiness of cursive script. He has this feeling. This is called implicit synaesthesia in our psychology. In fact, writers, artists and poets in China are all like this, and Du Fu is in Kuimen. Why did he shed three tears after listening to the ape's words, and let it be empty with August? The voice of the ape is so far away, so piercing and so helpless. He will feel that if he suddenly hears three donkey barks at Kuimen at this time, he will not be able to write a poem. Listen to the donkey shed three tears, no, everything is synaesthesia. If you feel this way, something will cause trouble, and you will feel it from its voice. It is connected with everything in nature.