How does the author describe his personal experience and motivation for writing the Sai Satcharita in Chapter 49?

In Chapter 49, the author explains that he is not the true creator of the Satcharita but merely an instrument for Sai Baba. He confesses that Sai is the actual composer and writer of the book. The author describes how, if laziness ever comes to him or he forgets the narrative, Sai provides the remembrance at the right time. A story can manifest so unexpectedly that he feels compelled to take up his pen. He concludes that the merciful Sainath entered his mind and got His own book written, fulfilling the author's desires in the process. This was done for the author's own self-interest and to share Sai's unfathomable stories with other devotees.