According to Chapter 40, what was the initial inspiration for writing the Shri Sai Satcharitra?

The initial inspiration for writing the Shri Sai Satcharitra is detailed in Chapter 40. The author recounts witnessing Sai Baba's leela of setting up a grinding stone and grinding grain in Shirdi. This seemingly simple act filled the author's mind with wonder and sparked a strong desire to describe all of Sai's deeds. The purpose, as mentioned in Chapter 40, was that by singing the praises of a devotee like Sai, one's own impurities and sins would be destroyed, an act that pleases God even more than praising God Himself.