Based on the introduction to his story, what core principle is the tale of Damu Anna meant to teach the reader?

The introduction to Damu Anna's story in Chapter 25 is meant to teach the core principle of unwavering faith and its rewards. The text states that 'Once one-pointed faith is established, Sai wards off all the misfortunes of that devotee.' The story is presented as a report that shows Sai's love and how the 'Guru-Mother is an Ocean of Mercy.' The narrative of this wealthy devotee from Ahmednagar, though described as short, is intended to be pure in its meaning. By listening to it, the reader is meant to understand how their own difficulties can vanish through devotion and faith in the Guru.