The Substantial and the Insubstantial - Chapter 6 of The Art of War - Naked book reading In the chapter 'The Substantial and the Insubstantial,' Sun Tzu discusses the concept of distinguishing between the substantial and the insubstantial in the art of war. This part of the book offers an in-depth understanding of how to identify and utilize these concepts to achieve strategic objectives. Get ready to contemplate how to discern the substantial from the insubstantial and how to apply it on the battlefield.