What specific promise did Sai Baba make about His role in the creation of his life story?

In Chapter 2, Sai Baba makes a profound and direct promise regarding His role in the book's creation. After giving His permission and blessing for the project, He reveals that the author is only an instrument. Baba's definitive promise was, "He is merely a pretext; I myself shall write my own story! I should tell my own story and fulfill the devotee's wish." This statement elevates the book from a mere biography to a divine autobiography, written by Sai Baba through the hands of His chosen devotee. He further promised that when the author's ego was dissolved, He Himself would enter and write, ensuring the work was accomplished by the One to whom it truly belongs.