The text mentions a specific narrative structure for the book. How was the chapter about the Gita discussion an exception to this structure?

The author notes in Chapter 39 that the book generally follows a structure where a hint for the next chapter's subject is given at the end of the current one. However, this was not the case for the chapter preceding the discussion on the Bhagavad Gita. The author states that there was no memory of what the next story would be. It is explained that this was a special case where the topic was not pre-planned but rather came about by Sai's grace. The narrative clarifies that 'Whatever subject Sai brings to mind will be the one to be narrated,' highlighting that Sai's divine will directly inspired the inclusion of the profound dialogue with Nana Chandorkar.