What inspired the author to write this book, based on the information in Chapter 40?

According to Chapter 40, the inspiration to write the Shri Sai Satcharitra stemmed from a 'strong desire' that arose in the author's mind to describe Sai's divine deeds, such as the act of grinding grain in Shirdi. The author believed that narrating these events would serve to destroy impurities and sins. Chapter 40 reinforces this motivation by stating that God Himself is pleased when someone sings the praises of His devotees, a claim the author notes is supported in the Bhavishyottara Purana. Ultimately, the author views the entire project as Sai's own inspiration, approved by Him for the welfare of the devotees.