Boya Visits His Friend is the allusion in every edition, and one of the best-known friendship stories in China. Yu Boya was a master of the zither. One night by the river a woodcutter named Zhong Ziqi heard him play and said, of one piece, that he could see high mountains, and of the next, flowing water. No one had ever heard his music so exactly, and the two became sworn friends, agreeing to meet again the next year. When Boya returned, Ziqi had died. Boya broke his zither and never played again, since no one was left who truly heard him. The poem's third line points straight at this story, and it suits a lower stick that tells you to share yourself only with those who understand.