All too often, standard textbooks of traditional Chinese medicine base their theory and therapeutic strategies on the disease. The ancient books, by contrast, base their theory and therapeutic strategies on the patient's energetic state.

Once we have understood this energetic state, we can act as the "second doctor", observing, prompting or assisting the "first doctor" — who is none other than the patient. If, on the other hand, we base our treatment on the disease, we risk taking the place of the "first doctor" and acting in the wrong direction (Dr Li Xin).

In keeping with the Huang Di Neijing, Dr Li Xin works "at the third level", as do the "good doctors of traditional Chinese medicine". The authors believe this quest is essential for all who seek to understand the essence of TCM. It deserves to be shared — this is how the idea of writing this book was born.