The preface of the Qingnang Sutra is the internal and external transmission of the Baozhao Sutra and the Qingnang Aoyu.
Yang Gong only left the Qingnang Sutra Preface, Tianyu Sutra Internal and External Transmissions, and Baozhao Sutra Qingnang Aoyu. The rest were written by descendants in the name of Yang Gong. Their authenticity is compared with the above-mentioned sutras. The authenticity can be known immediately. The real Yang Gong Jingjue was not written so clearly.