(1) Qin Shihuang thought that immortality seemed to have a natural relationship with long-term stability. In order to seek the elixir of life, Qin Shihuang spent a lot of energy, money and material resources, and tried his best to seek immortality and worship Zen. The most typical example is sending Xu Fu to take 3,000 boys and girls to the East China Sea to seek immortality. The scale is unprecedented, but there is no news of it.
Qin Shihuang's magic, which had high hopes, did not receive any effect, but the real threat he faced was growing. In the twenty-ninth year of the first emperor (2 18 BC), he was assassinated during his eastern tour. Although he survived, he was badly hurt. However, two years later, he traveled incognito in Xianyang and was attacked again. This time, the blow was even worse than the last time. The assassination was still outside Qin, and this time the danger occurred in Xianyang, the capital. Even the security of the capital has become a problem, and his inner helplessness and panic can be imagined.
In this context, he relied more on mysticism, and he was anxious to find out the exact reason that threatened the Qin empire and the exact answer about his own safety. In the thirty-second year of the first emperor, that is, 2 15 BC, Lu Sheng was sent to ask the immortals to give directions on the future development. On this trip, Lu Sheng got nothing. When he came back, he sang praises to Qin Shihuang, boasting that there was nothing substantial between his words. Qin Shihuang listened to people's flattery for many years. That's not what he needs. What he longs for is something that is really conducive to consolidating the regime. So he sent Lu Sheng to the sea to ask the immortal for advice. The alchemist, who always came back in vain, brought back a book. This book records a shocking secret: "Hu Ye died in Qin", and Lu Sheng's so-called "immortal book" is exactly what Qin Shihuang wanted.
(2) As far as the State of Qin is concerned, its early history of the founding of the People's Republic of China can be called the history of fighting against the Hu people, with both lessons of failure and successful experiences. When Qin Shihuang unified the whole country, the Huns gradually merged into a relatively unified country, and their strength increased. In the thirty-second year of Qin Shihuang (2 15 BC), when Yan Lu Sheng gave him a picture of "Hu Ye who died in Qin", Qin Shihuang's mood did it one brace up. He felt that it was time to show his talents and eliminate the hidden dangers of the Daqin Empire. Such a prediction: "All the people who died in Qin were Hu Ye." It was not only in line with the uneasy relationship between Qin and Xiongnu at that time, but also in line with Qin Shihuang's mind, which provided a good excuse for Qin Shihuang to send troops to conquer Xiongnu.
(3) When Lu Sheng said Hu, he meant the Huns, while Zheng Xuan, a great scholar in the Han Dynasty, commented that Hu, who died in Qin, meant Hu Hai instead of Hu. We have the right to laugh at this hindsight explanation.