What is the profound significance of Sai Baba grinding grain, as detailed in Chapter 40?

Chapter 40 reveals that the act of Sai Baba grinding grain in Shirdi holds a deep significance for the creation of the Shri Sai Satcharitra itself. The text describes the scene of the saint spreading His legs, setting up the grinding stone, and pouring the grain, an image that fills the author's mind with wonder. This very act is identified in the chapter as 'the root of this book.' It sparked a strong desire in the author's mind to describe all such deeds of Sai, believing that by doing so, impurities and sins would be destroyed. The chapter further suggests that God is most pleased when one sings the praises of His devotees, reinforcing the motivation behind the book's composition.