How does the text explain the cause-and-effect relationship between a devotee's faith and Sai Baba's intervention?

The text outlines a clear spiritual principle regarding faith and its results. Chapter 25 states that as soon as "one-pointed faith" is established in a devotee, Sai Baba actively intervenes in their life. This intervention has three main effects: Sai wards off all of that devotee's misfortunes, grants them their desired objects, and removes their suffering. The narrative introduces the story of Damu Anna as a specific report or case study to demonstrate this very principle and to show how Sai, the "Guru-Mother," is an "Ocean of Mercy." The text suggests that understanding this relationship between faith and grace will fill a listener's heart with joy.