First, the reason of Lenovo. After the 5th century A.D., due to foreign invasion, the rise of local feudal forces and the disintegration of the unified dynasty, many small countries appeared in politics and governance, all of which fought by themselves and advocated force. In this way, the theory of non-violence and non-cooperation is no longer suitable for them. Without the support of Wang Li, divine power naturally cannot develop and will decline.
Second, internal reasons. After strictly observing the precepts and laws and living a poor life, Buddhist monks and groups gradually developed their temples and temple economy during the Mahayana Buddhism period, and their teachings changed a little, which was supported by secular nobles and businessmen. Many monks and nuns live a luxurious life, and after they develop into esoteric religion, they will naturally not be enjoyed by the general public. At the same time, coupled with the influence of Shiva-Romanism, Buddhism gradually lost its social influence.
Third, external reasons. Due to the invasion of Islam, Islam and Buddhism in Central Asia, the strategy of "leaving the town cold, oppressing politics and forcing the survivors to reform" was adopted. Cultural relics of temples and courtyards that believe in Islam, Islam and Buddhism were destroyed and destroyed, and monks were isolated until 1203.