In China, the Lotus Sutra was characterized as the teaching that unifies all good, meaning that all good ideas are brought together and unified in the Lotus Sutra. Inheriting this tradition, Tiantai Zhiyi created a single great philosophy with the Lotus Sutra as its nucleus. It is no exaggeration to say that Zhiyi achieved a unification and systematization of Buddhist thought for the first time. He made use of various sutras and treatises by taking as his central idea that the Lotus Sutra itself is a synthesis of broad and profound thought. He called the inclusiveness of the sutra “opening and integrating,” and made it the key concept in his systematization of a philosophy of synthesis.