Based on the introduction to Damu Anna's story, what is the relationship between a devotee's faith and Sai Baba's grace?

Chapter 25 establishes a direct and powerful link between a devotee's faith and Sai Baba's divine intervention. The text explicitly states that once 'one-pointed faith is established,' Sai Baba actively 'wards off all the misfortunes of that devotee.' It goes on to say that He grants their desired objects and removes their suffering. Damu Anna's story is presented as a testament to this principle, a report to show Sai's love and how the 'Guru-Mother is an Ocean of Mercy.' This illustrates the core belief that sincere and focused devotion can make one's difficulties vanish through Sai's grace.