According to the article, what are the reasons why Liu Ningzhi was hired as a state official many times?

The reason is to emphasize its virtue.

Liu Ningzhi, whose real name is Zhi 'an and nickname is Chang, is from Zhijiang, South County. Father, Hengyang satrap. My brother is a man, noble but not official. Ning is eager to be old and be a man, pushing his family wealth and his younger brother and son to settle down in the wild unless he can't eat. The country cherishes its virtues. State three rites monarch west cao master book, don't. His wife Quanguo, Liangzhou Secretariat, also sent her rich and scattered relatives. A wife can also share weal and woe with Ning without envy of splendor.

(Excerpted from Biography of Song Shu's Seclusion, omitted)

Note: Be an official. Bi: Call-up. Main book: official name.

Liu Ningzhi, nicknamed Zhi 'an for many years, is from Zhijiang, South County. His father is a public official and used to be the magistrate of Hengyang; Brother Gong Sheng, arrogant, is not an official. Ning admired Lao Laizi and gave all his possessions to his younger brother and nephew and built a house in the middle of nowhere. He doesn't eat the food he earned, and people in the state value his moral behavior. The state respectfully recommended him as Cao's master book for many times, and recommended him as a scholar, but he did not take office. His wife is the daughter of the state of Liangzhou, and his dowry is very rich, so he distributed all his money to relatives and friends. A wife can live a simple and poor life with Ning without being jealous of wealth. The couple took a humble car made of bamboo together, went shopping in the market and sold the remaining products. The money they got was given to others except for daily use.