What specific action of Sai Baba is mentioned at the beginning of Chapter 40, and what was its significance?

In Chapter 40, the author recalls a wondrous image of Sai Baba's actions. It describes how the saint would set up a grinding stone, spread His legs, and grind grain. This seemingly simple act filled the author's mind with wonder and sparked a powerful desire to write about all such deeds. The chapter suggests that this vision was a foundational inspiration for the Shri Sai Satcharitra, as the author believed that describing these holy acts would destroy impurities and sins. This act is presented as a key catalyst for the creation of the book.