The Sijiaoyi, T 1929.46.721a-769a. A twelve fascicle work by Zhiyi 智顗, the founder of Tiantai Buddhism. This treatise is devoted to the detailed and systematic exposition of the Four Teachings (one of the schemes by which the Buddhist sutras and treatises are arranged in the Tiantai tenet classification system). The four teachings are: (1) sancang 三藏the Tripitaka teaching; (2) tong 通 the Pervasive or 'shared' teaching; (3) bie 別 the Distinct teaching and (4) yuan 圓 the Complete teaching. Originally it formed a part of his commentary on the Vimalakīrti-nirdeśa-sūtra 維摩經, which he finished in 595 C.E.