The chin of the (whole) body, through practice becomes one unit. Distinguish clearly between substantiel and insubstantiel. To fa chin (discharge) it is necessary to have root. The chin starts from the foot, is commanded by the waist, and manifested in the fingers, and discharges through the spine and back. One must completely raise the spirit (pay attention) at the moment when the opponents is just about to manifest, but has not yet been released. My chin has then already met his (chin), not late, not early. It is like using a leather (tinder) to start a fire, or like a fountain gushing forth. (In) going forward or stepping back, there is not even the slightes disorder. In the curve we seek the straight, store, then discharge; then you are able to follow your hands and achieve a beneficial result. This is called borrowing force to strike the opponent or using four onces to deflect a thousand pounds.
Red.: from Five Character Secret (Calm, Agility, Breath – to gather the chi, The internal force – the complete chin, Spirit – Shen concentrated).
Reference: T’Ai Chi Ch’Uan Ta Wen, Questions and Answers on T’Ai Chi Boxing Chen Wei-Ming ( Benjamin Pang Jeng Lo & Robert W. Smith ) North Atlantic Books 1985