The deer calls each other for food, and the felling wood calls for friends. This aphorism for making friends comes from Wei Yuan's "Gu Wei Tang Nei Ji" [Qing Dynasty], which is a reference to Cao Cao's "Dan Ge Xing" ：Yo yo deer calls, eating apples in the wild. I have guests who play the harp and sheng. Meaning: When the elk find mugwort, they will call each other. If I have a guest, I must play the harp and sheng.