According to the query of Chinese website, making friends means making like-minded friends, learning from each other and encouraging each other in character. Analysis: this is about the "friendship" in the five ethics, which is the expansion of brotherhood. If a person can really achieve "brotherhood", he will certainly make good friends. If brothers and sisters don't get along well, where can there be real friends? Therefore, the second of "ten useless" only says "brothers are not harmonious, making friends is useless." Starting from the Southern and Northern Dynasties, Zhou Xingsi accepted Fu Xun's Thousand-Character Works and entered the mother document. Uncle Zhu, you are better than your son. The Kong Huai brothers are also in this spirit. Make friends, score points, and sharpen the rules. Kindness is hidden, it is better to leave. Retire honestly and lose money.