What is the significance of Sai grinding grain as mentioned in Chapter 40, and how does it relate to the purpose of the book?

According to Chapter 40, the image of Shri Sai setting up the grinding stone and grinding grain is profoundly significant, as it 'is the root of this book.' This act inspired a strong desire in the author's mind to describe all of Sai's deeds, with the belief that doing so would destroy impurities and sins. The chapter reinforces this purpose by stating that God (Hari) loves it when someone sings the praises of His devotees, even more than His own praises. To substantiate this, the text cites the Bhavishyottara Purana, where Tripurari (Shiva) makes the same claim. Therefore, this act of grinding grain is presented in Chapter 40 as the foundational inspiration for a book dedicated to glorifying a saint.