Based on Chapter 25, what is the relationship between a devotee's faith and Sai Baba's grace?

Chapter 25 of the Shri Sai Satcharitra explains that Sai Baba desires one-pointed devotion from his followers. It states that a devotee who is faithful and filled with devotion will lack nothing in attaining their desires. The chapter emphasizes that once one-pointed faith is established in a devotee, Sai wards off all their misfortunes, removes their suffering, and grants their desired objects. This concept is introduced just before the story of Damu Anna, which is presented as an example of Sai's profound love for His devotees who possess such unwavering faith.