Song of Substance and Function

1. Taijiquan. Thirteen postures.
The marvel lies in the nature of qi; yin and yang.

2. It changes into infinity and returns to the one.
Returns to the one, taijiquan.

3. The two primary principles (yin and yang) and four manifestations are without boundary.

To ride the wind, the head is suspended at the crown, from above.

4. I have words for those who can understand:
“If the yonquan (bubbling well) has no root, or the yao (waist) has no control, life long practise will be in vain”.

5. There is no secret about the substance and function, they interrelate.
The only way is to let wide and flowing qi extend into the fingers.

6. Always remain in central equilibrium during peng (ward off), lu (roll-back), ji (press), an (push), cai (pluck), lie (split), zhou (elbow strike) and kao (lean-on), and also when steeping forward, sitting backward, looking left, looking right, and staying centered.

7. Neutralizing without neutralizing, yielding without yielding.
Sit back before you move forward.

8. When the body is like a cloud, the whole body functions as the hands.
The hands are not [only] the hands.

9. The mind must always remain aware.

Reference:
The Song of Substance translated by Wee Kee Jin
Taijiquan Wuwei: A Natural Process
ISBN 9780473097813

p. 123