Song of the Precious Mirror Samadhi
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The Song of the Precious Mirror Samadhi (Chinese: 寶鏡三昧歌; pinyin: Baojing sanmei ge; Wade–Giles: Pao-ching San-mei-ke; Japanese: Hōkyō Zammai; also translated as Song of the Jeweled Mirror Samadhi and Sacred Mirror Samadhi) is a Zen poem in Classical Chinese that appeared during the Song Dynasty. The work is often attributed to Dongshan Liangjie (Japanese: Tōzan Ryōkai), the co-founder of the Caodong/Sōtō branch of Zen Buddhism, although modern research suggest this is unlikely.
The poem is first mentioned in Juefan Huihong's biographical compilation of 1119, the Chanlin sengbao zhuan (Chronicle of the Sangha Treasure in the Groves of Chan), written over 200 years after Dongshan Liangjie's death. Huihong, however, does not attribute the poem to Dongshan. He writes instead that the poem was given to Dongshan by his teacher, Yunyan Tansheng. Huihong further speculates that Yunyan's teacher, Yaoshan Weiyan, probably entrusted it to him in turn. Huihong relates that he came upon the poem in 1108, when it was given to a scholar Zhu Yan by a monk, whom he does not identify. The scholar Morten Schlütter notes that the poem's provenence is doubtful given the way it came to Huihong, and furthermore the style differs substantially from works of the era that Huihong attributes it to. Most later historical sources, such as the Zengaku daijiten, the Bussho kaisetsu daijiten, and Shinsan zenseki mokuroku, attribute the poem to Dongshan Liangjie rather than Yunyan, although again, neither is likely to be the true author. 
- Text and Background of the Song of Precious Mirror Samadhi by Ch'an Master Tung-shan Liang-chieh
- JEWEL MIRROR SAMADHI TRANSLATION STUDY