How does the author of the Sai Satcharitra introduce the story of Damu Anna, and what is the stated purpose of telling this tale?

The author introduces the story of Damu Anna in Chapter 25 as a report that demonstrates Sai Baba's profound love for His devotees. The stated purpose of sharing this tale is to fill the listeners' hearts with joy and help them understand how the "Guru-Mother is an 'Ocean of Mercy.'" The text encourages listeners to give their attention to this "novel story," promising that their difficulties will vanish. It is framed as a lesson on how Sai wards off the misfortunes of any devotee who establishes one-pointed faith, granting their desires and alleviating their suffering.