This book is written by Sifu Dou Haam Chou, who has been practicing and teaching Wing Chun for decades. Early by the end of the 60's, Sifu Kwok Fu had already asked the author to write about the significance of Wing Chun. Until today, the book is complete.
Moreover, Sifu Kwok Fu is one of the Wing Chun follower of Sifu Yip Man. Before Sifu Yip Man went to Hong Kong, he gave the manuscript "The Secret of Wing Chun" to Sifu Kwok Fu, and luckily, the author had the opportunity to access the manuscript, and to study the insight of Wing Chun from Sifu Kwok Fu and the manuscript.