"It is enough to have a bosom friend in life, and treat each other with a bosom friend." This is a message to Qu Qiubai, which means that as long as you have a true friend who knows yourself completely. In difficulties and hardships, the inner ties are closely linked and share weal and woe.

Those who delete branches and leaves decide not to get flowers and fruits. It is also the friendship that Mr. Lu Xun said.