In this paper, I studied the concept of sandi (三諦) in the commentaries of Zhiyuan (智圓) of the Shanwai (山外) sect and Chuandeng (傳燈), and Zhixu (智旭) of the Ming dynasty. I discovered that they regarded sandi as zhendi (眞諦), sudi (俗諦), and zhongdi (中諦) (roughly: ultimate truth, conventional truth, and medial truth). And I discovered that Zhiyi (智〓) regarded sandi as zhendi, sudi, and zhongdi too, and he didn't regard sandi as kongdi (空諦), jiadi (假諦), or zhongdi. So I thought that these commentaries faithfully succeeded to Zhiyi's sandi concept.
