心與意合，意與氣合，氣與力合，內三合也，手與足合，肘與膝合，肩與胯合，外三合也，此為六合，左手與右足相合，左肘與右膝相合，左肩與右胯相合，右之與左以然，以及頭與手合，手與身合，身與步合，孰非外合，心與眼合，肝與筋合，脾與肉合，肺與身合，腎與骨合，孰非內合，豈但六合而已哉，然此特分而言之也，總之一運而無不動，一合而無不合，五形百骸，悉用其中矣。
The Xin & Yi combine, the Yi & Qi combine, the Qi & Li combine, are the Internal Three Harmonies. The Hands & Feet combine, the Elbows & Knees combine, the Shoulders & Hips combine, are the External Three Harmonies. These are the Six Harmonies. The left hand & right foot mutually combine, the left elbow & right knee mutually combine, the left shoulder & right hip mutually combine. It is also thus with the right’s combination with the left. Additionally, the Head combines with the Hands, the Hands combine with the Body, the Body combines with the Steps, which are not included in the External Harmonies. The Heart & Eyes combine, the Liver & Tendons combine, the Spleen & Muscle combine, the Lungs & Body combine, the Kidneys & Bones combine, which are not included in the Internal Harmonies. How? Yet they are still nothing more than the Six Harmonies! Thus, these are unique distinctions regarding this subject. In every case, when one moves then there are none that are motionless, when one combines then there are none that are not combined. In all cases, the usage of the Five Shapes & Hundred Bones of the body are included among these.
Lessons Learned in the World of Martial Arts 