世界悉檀

One of the four (sa) siddhāntas: the Buddha's line of reasoning in earthly or common terms to draw men to the higher truth.

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世即隔別之義， 界即界分也。 蓋由眾生根器淺薄， 故佛隨其所欲樂聞， 為之次第分別而說， 令生歡喜， 是名世界悉檀。