Zǐ tíng nèi mì jué xiū xíng fǎ 紫庭內祕訣修行法

Secret Instructions of the Purple Court for the Dharma of Cultivation

Anonymous; Táng

A Táng Daoist meditation-manual on the visualization of the Three Origins (sān yuán 三元) — the three dāntián 丹田 (upper/middle/lower) together with their resident deities (Chìzǐ 赤子, Zhēn rén 眞人, etc.), following the Huáng tíng jīng 黃庭經 framework of inner-body gods. Preserved as DZ 874 / CT 874 (Dòngshén bù, Fāngfǎ lèi 洞神部方法類).