抱朴子曰:復有太清神丹,其法出於元君。元君者,老子之師也。太清觀天經有九篇,云其上三篇不可教授,其中三篇世無足傳,常瀋之三泉之下,下三篇者,正是丹經上中下,凡三卷也。元君者,大神仙之人也,能調和陰陽,役使鬼神風雨,驂駕九龍十二白虎,天下衆仙皆隸焉,猶自言亦本學道服丹之所致也,非自然也。ctext.org. See translation in "Humans, Spirits, and Sages in Chinese Late Antiquity: Ge Hong's Master Who Embraces Simplicity (Baopuzi)", in Extrême-Orient, Extrême-Occident, 2007, N°29, pp. 95-119. Academia.edu.
抱朴子曰:復有太清神丹,其法出於元君。元君者,老子之師也。太清觀天經有九篇,云其上三篇不可教授,其中三篇世無足傳,常瀋之三泉之下,下三篇者,正是丹經上中下,凡三卷也。元君者,大神仙之人也,能調和陰陽,役使鬼神風雨,驂駕九龍十二白虎,天下衆仙皆隸焉,猶自言亦本學道服丹之所致也,非自然也。ctext.org. See translation in "Humans, Spirits, and Sages in Chinese Late Antiquity: Ge Hong's Master Who Embraces Simplicity (Baopuzi)", in Extrême-Orient, Extrême-Occident, 2007, N°29, pp. 95-119. Academia.edu.