○淨土宗以三經一論立宗
Four Essential Doctrines (四宗要文)
About 四宗要文
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The *Four Schools Compendium* was initially compiled by the Japanese monk Nichichō during the Edo period and later supplemented by the monk Eien. This work systematically organizes the core doctrines and key scriptures of the four major Chinese Buddhist schools: Tiantai, Huayan, Faxiang, and Sanlun. It reflects the Japanese Buddhist inheritance and development of Chinese Buddhist theories. As an essential outline of Buddhist doctrinal studies, it serves not only as a crucial document for researching the integration of East Asian Buddhist thought but also provides scholars with a clear framework for comparing teachings, holding authoritative status in the field of Buddhist doctrinal classification studies.