The significance of playing the flute in Hanshan to call for spring return

In Hanshan's "The Flute Calls the Earth", the exiles look at each other with tears. Countless geese parked by the lake in the evening have been eager to fly north until dawn.

Meaning: Playing the flute in cold weather makes friends and guests who are leaving cry at each other. Countless geese flew by Dongting Lake overnight, but they all flew away before dawn.