Because Yuan Tiangang knew that the official careers of the three of them were not smooth sailing, and they would all be demoted later. These three people are Du Yan, Wang Gui and Wei Ting. All three have achieved high achievements in officialdom, but their official careers have been relatively bumpy. Yuan Tiangang was a well-known fortune teller at that time. He was very powerful and his calculations were accurate. He predicted the careers of Du Yan, Wang Gui and Wei Ting.
It is said that Wu Zetian’s Qianling Mausoleum was chosen based on Yuan Tiangang’s Feng Shui calculations. Later, Yuan Tiangang and Li Chunfeng chose the location of the Qianlong Mausoleum for Wu Zetian which was very good. Many emperors’ tombs were discovered and opened. , only Wu Zetian's Qianling Mausoleum had no influence. This shows how powerful Yuan Tiangang is. For such a powerful person, there must be many people who want to ask him to tell fortunes, but Yuan Tiangang is not a man who lacks power and is greedy for money, so if you want to meet him, you cannot use bribery. It really depends on fate.
Yuan Tiangang looked at the faces of the three of them, and they were all people who could become high-ranking officials in the future, but their official careers were not smooth sailing. Sure enough, all three of them were demoted to Xizhou because of what Yang Wen did. Wei Ting had a good relationship with Li Jiancheng, and was later transferred to Xizhou. After the Xuanwumen Incident, Emperor Xuanzong of the Tang Dynasty requisitioned Wei Ting as the chief doctor of the Ministry of Personnel.
Du Yan served as an official in the Sui Dynasty in his early years and served as the censor Zhongcheng. After he surrendered to the Tang Dynasty, he was requisitioned by Emperor Taizong of the Tang Dynasty. However, he was implicated in the Yang Wenqian incident and was exiled to Xizhou. After the establishment of the Tang Dynasty, Wang Gui became a confidant of Prince Yin Li Jiancheng, and was later exiled to Yizhou because of the Yang Wenqian incident. To sum up, although the three of them all have the appearance of high-ranking officials, their official careers are not bright, and they were all demoted and exiled because of Yang Wenqian's incident.