How does the author of the Sai Satcharitra introduce Damu Anna's story and what is the intended takeaway for the reader?

In Chapter 25, the author introduces the story of Damu Anna as a powerful illustration of Sai's love and protective nature towards His devotees. The author posits that once a devotee establishes 'one-pointed faith,' Sai actively wards off their misfortunes and removes their suffering. The story is called 'novel' and 'very pure in its meaning,' with the promise that listening to it will fill the heart with joy and cause difficulties to vanish. The intended takeaway is to recognize the Guru-Mother as an 'Ocean of Mercy' and to understand that unwavering faith in Sai leads to the fulfillment of desires and protection from worldly troubles.