1. During the Spring and Autumn Period, Yu Boya was the best performer at that time, but he played the piano all day and no one appreciated him. One day, I met Zhong Ziqi and heard Boya's piano playing and jumping. I said that I was ambitious in the mountains; When you hear the piano turn a thousand times, you say you are swinging in the running water. So they became the father of Mo's rebellion. Later, the little chef of hippo died of illness. Boya lamented that there was no bosom friend, so he broke his precious piano and stopped playing.

2. Fan Zhongyan in Northern Song Dynasty angered the imperial court by advocating reform, and was banished to Yingzhou. When Fan Zhongyan packed his bags and left Beijing, some officials who were close to him on weekdays, fearing to be described as cronies, withdrew one after another. An official named Wang Zhi didn't. He is ill at home. After hearing the news, he immediately went to the hospital and swaggered Fan Zhongyan out of the city gate. In that feudal society where one person committed a crime and implicated nine clans, Wang Zhi could treat his friends sincerely regardless of personal interests and losses, which was really commendable compared with those who forgot their righteousness for profit. For Fan Zhongyan, it is very clear at this moment who is a true friend and who is a false friend.

3. Feng and Biography: Zhai Gong was once lord protector. At that time, it was full of guests, but after he was removed, he was left out in the cold to catch birds in front of the door. Soon after, he became Tingwei again, and all the guests wanted to curry favor with him. Zhai Gong wrote conspicuously on the gate: "Friendship is not known until you die; Poverty and wealth are a state of knowing each other; One is expensive and the other is embarrassing, and friendship is visible. " ("Only between life and death can we know the depth of friendship; Between poverty, we know the true attitude of our friends; Between noble and humble, we know what true friendship is. " )

4. Engels and Marx.

In order to be economically independent of Marx's revolutionary activities, Engels helped his father run the enterprise he hated against his will. At that time, although he and Marx lived in the same city, they corresponded almost every day, encouraging and promoting each other in the revolutionary cause. After Marx's death, Engels worked as the organizer of the manuscript, edited and published the second and third volumes of Das Kapital, and completed the unfinished business of the comrades. It can be seen that common ideals and life goals are the basis for establishing friendship.

Guan Zhong and Bao have been good friends since childhood. Bao knows that Guan Zhong is a talented person. Guan Zhong and Bao do business together and get more dividends. Bao Shu Ya doesn't think Guan Zhong is greedy, but he knows that his family is poor. When Guan Zhong was fighting, he attacked backwards and retreated first. Bao Shu Ya knew that Guan Zhong had an old mother at home, and he didn't think Guan Zhong was timid.

When Guan Zhong died, Qi Henggong asked him to recommend a successor. He didn't recommend a package. Someone told Bao that Bao said, "I'm a man who hates diseases as much as enemies. Being the prime minister has made things worse. Guan Zhong knows me! " !