According to Chapter 53, how does the story of the book's completion itself serve as a spiritual lesson for devotees?

Chapter 53 frames the story of the Shri Sai Satcharitra's completion as a powerful lesson in surrender and faith. The original author, Hemadpant, a "jewel among poets," unexpectedly passed away before he could write the promised summary. This event powerfully underscores the teaching that "Baba’s will is more powerful" than any human plan. The subsequent author's deep feelings of inadequacy and his reliance on prayer highlight the necessity of depending on the Guru's grace rather than one's own intellect. By concluding that Sai himself is the true writer and his mouth is "merely an instrument," the chapter demonstrates that divine work is accomplished through the Guru's power, teaching devotees to surrender their ego and allow the Sadguru to work through them.