Fa Zhen was known for being studious and well versed in readings from different schools of thought. His fame as an erudite scholar spread throughout the Shaanxi and Gansu areas. He had hundreds of students who came from various locations to study under him. Among them was Fan Ran. The Sanfu Jue Lu Zhu recorded that when Fa Zhen was still a teenager, he once attended a meeting between his father and his father's subordinates. After the meeting, Fa Xiong asked his son, " Who do you think is a great talent?" Fa Zhen replied, "Hu Guang possesses the calibre of a high minister." He was proven right because Hu Guang rose through the ranks later and held positions among the Nine Ministers and Three Ducal Ministers. Fa Zhen led an unassuming and humble, but reclusive life. The Administrator of Fufeng Commandery heard of him and invited him for a meeting. Fa Zhen wore a fujin to the meeting. The Administrator attempted to use the example of Confucius serving as a politician in the Lu state to persuade Fa Zhen to serve in the Han government. Fa Zhen replied, "I dared to come here because I saw you treating your guests in a respectful manner. However, if you want me to join the civil service, I will travel farther north beyond the northern mountain and farther south beyond the southern mountain." The Administrator was taken aback by Fa Zhen's response and did not dare to speak again about recruiting Fa Zhen into the civil service. Fa Zhen continued receiving offers to serve in the Han government but he declined all of them. Tian Ruo, who was also from Fufeng Commandery, once wrote a memorial recommending Fa Zhen to the imperial court, and recommended Fa again when Emperor Shun visited the Shaanxi region. The emperor consecutively sent out four offers to Fa Zhen to join the civil service, but Fa turned down all of them. Fa Zhen said, "If I can't conceal myself from the rest of the world, can I drink water that will make me deaf to the world?" He then retreated further into seclusion and maintained his refusal to become an official. Guo Zheng, a friend of Fa Zhen, once said, "You can easily hear news about Fa Zhen, but you can't see him in person easily. He tries to escape from fame but fame follows him; he tries to avoid fame but fame chases him. He is truly a master of hundreds of generations!" Fa Zhen died of natural causes in 188 during the reign of Emperor Ling at the age of 89.