It is enough to have a bosom friend in life. This sentence was given to Qu Qiubai by Lu Xun, from a couplet that Lu Xun gave to Qu Qiubai. The original words are "it is enough to have a bosom friend in life, and treat each other with the same heart."
"It is enough to have a bosom friend in life, and treat each other with a bosom friend." This is a sentence from Lu Xun 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.