The Zhengyi Section 正一部

It is the fourth section of the Four Assistants in the classification system of Taoist scriptures, connecting all parts of the Three Caves and the Three Tai (Taiqing, Taiping, Taixuan), and comprehensively presenting the Three Vehicles of Taoism.

According to Volume 6 of Yunji Qiqian (Seven Tablets in a Cloudy Satchel), the Zhengyi Section takes Zhenyi (True Unity) as its core tenet. Taishang Laojun personally descended in the late Han Dynasty, conferred the Three Heavens Orthodox Law and Zhengyi rituals on Zhang Ling, appointed him Heavenly Master, and instructed him to pass them down to later generations.

The existing version of the Daozang (Taoist Canon) still mainly collects the Three Heavens Orthodox Law, Lingbao Great Law, and Zhengyi rituals, but also includes other miscellaneous works.