Illustrated Commentary on Nine Chapters, Vol. 1

In order to recognize the essential principles, it has already been eight years since the passing of the Master. Having been fortunate enough to see the completion of this book, I am filled with emotion that the Master could not see it for himself, and I hold an even greater hope that his other works will be collected and compiled one after another. I could not refuse the request to add these words, and I respectfully write this for the enlightenment of later students.

Dai Dunyuan the author of this preface respectfully writes.