妙法莲华经
Tendai Buddhism reveres the "Lotus Sutra" as the highest teaching in Buddhism. In Saichō's writings, he frequently used the terminology "hokke engyō" to imply it was the culmination of the previous sermons given by Gautama Buddha. Because of the central importance of the Lotus Sutra, Tendai Buddhism sees all Buddhist teachings and practices as being united under the One Vehicle (ekayana) taught in the Lotus Sutra. Saichō frequently used the term "ichijō bukkyō" and referred to the second chapter of the Lotus Sutra as his main scriptural basis.