According to Buddhist tradition, the Sutras record what the Buddha himself taught. During the life of more than 40 years of teaching the Buddha's teachings, the number of teachings of the Buddha was extremely large. In addition, depending on the origin and comprehension of the disciples, there exist different teachings. During the transmission of the dharma, local cultural differences also affected more or less the meaningful discourses, leading to disagreements in the way of understanding the Buddha's teachings.