Compiler of the Wumenguan (無門關, Gateless Barrier), the most widely studied koan collection. Attained awakening after six years of working on Zhaozhou's 'No'. The Wumenguan's 48 cases with verse commentary became central to Linji-lineage koan training.
References: Wikipedia | Terebess (Mumonkan) | CBETA Wumenguan | zh.Wikipedia
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