Chapter 40 mentions Sai grinding grain. What is the significance of this act as described in the text?

The act of Sai Baba grinding grain holds a special significance as detailed in Chapter 40. The author recounts the image of Sai, a saint, setting up the grinding stone and pouring grain, an act that filled the author's mind with wonder. This specific deed is identified as 'the root of this book.' According to the chapter, observing this act sparked a strong desire in the author's mind to describe all of Sai's deeds, believing that by doing so, the 'impurities (sins)' of the readers would be destroyed. Therefore, this simple, physical act is portrayed as the foundational inspiration for the entire Shri Sai Satcharitra.