Based on the provided text, how is the story of Damu Anna's cotton trade introduced, and what is its purpose?

The story of Damu Anna, subtitled 'The Cotton Trade,' is introduced in Chapter 25 as a specific example following a general statement about Sai Baba's power. The text first establishes the principle that 'Once one-pointed faith is established, Sai wards off all the misfortunes of that devotee.' Damu Anna's story is then presented as a 'report that shows Sai's love for His devotees.' The stated purpose of sharing this 'novel story' is to make the reader's mind 'experience how the Guru-Mother is an "Ocean of Mercy"' and to demonstrate Sai's readiness to protect those who are devoted to him.