What is the main conflict in Tao of Jeet Kune Do by Bruce Lee?

Bruce Lee's expressed intent for the work is not as an instruction manual or how-to guide. However, since the book is published after his death from notes and sketches compiled by his widow and an editor, it is an extensive study in the practice of Jeet Kune Do. The editor hopes the book is a source of ideas for all martial artists to develop without boundaries. Linda Lee hopes reading the book will help the reader come to know her husband and himself better.