What does the story of Ning He and Fan Ju tell?

Ning He, a poet of the Five Dynasties, was born in Xuchang, Yunzhou (now Dongping, Shandong). In the second year of Zhenming (9 16), he was a scholar and was famous for thirteen years. He was a bachelor of Hanlin in the later Tang Dynasty and a prime minister in the later Han and Zhou Dynasties. When Ning He paid tribute, he presided over scientific research and selected talents for the imperial court. Fan Ju was selected as a scholar and ranked 13th. Ning He said to Fan Ju, "I learned in those years and became famous at the age of thirteen. I hope you can inherit the mantle of the old lady. " It was a joke, but it really came true later. Fan Ju was born in Zongcheng (now southwest of Qinghe, Hebei). After being a scholar, he went through the Tang Dynasty, the Jin Dynasty and the Han Dynasty, and became an official in the middle school. In the late Zhou Dynasty and early Zhou Dynasty, he served as a servant and assistant minister. Zhao Kuangyin became the prime minister of the Northern Song Dynasty after the "Chen Qiao mutiny". His official position is similar to that of Ning He.