First Page of the Nine Yin Manual:

"The way of heaven:

Give surplus to the deficient

Hence: empty over full, deficient over surplus

It is expansive, profound, and captivating in meaning

The demarcation of earthly phenomena, of Yin and Yang formation

The understanding of changes, the manifestation of life and death

They just come into being without prior design or agreement

Dig into the roots, check for the Truth

This is the ultimate way, the beginning of rejuvenation

The understanding of heaven's will and earth's mysteries depends on intuition.

Integrity is shown by the legacy 

Effectiveness is proven by practice, there is no birth without impregnation

As for fastidious studies of the minute and hidden

Follow the right time and essence of the internal organs"