宋高僧傳 20.18

20.18

系曰：神仙道異，談論豈同乎？通曰：「昔小有真人能談空理，方諸山神仙建浮圖者信崇佛道，止不削染，號『在家菩薩』。又雪山諸仙善五明論求度者同也。然其相似道，必須甄簡。若西域二十諦中五唯量五大，與釋氏法名同。所計天殊，良難區別哉。」

The appraisal says: The paths of spirits and immortals are different; how could their discourses be the same? In explanation, it is said: "In the past, the Realized Man of Xiaoyou could discuss the principle of emptiness, and the spirits and immortals of Mount Fangzhu who built stupas faithfully revered the Buddha's path, only refraining from shaving their hair and dyeing their robes, and were termed 'lay bodhisattvas.' Furthermore, the various ṛṣis of the Snow Mountains who were skilled in the treatises on the five sciences and sought deliverance were likewise of this sort. However, their resembling paths must be carefully distinguished. As with the five subtle elements (tanmātra) and the five great elements (mahābhūta) among the twenty-five principles in the Western Regions, their names are identical to Buddhist dharmas. Yet what they postulate is as far apart as heaven and earth; truly they are difficult to differentiate!"