How does Chapter 13 illustrate the connection between a devotee's faith and physical healing through Sai Baba's intervention?

Chapter 13 provides a powerful example of faith leading to healing through the story of a Patil. He suffered from a disease and experienced two strange dreams: one of a teacher punishing a student and another where a gentleman used a grinding stone on his chest. As described in Chapter 13, despite the agony in the dreams, he woke up to find his disease had vanished completely, feeling an "unprecedented freshness in his mind." This experience, which he perceived as Sai Baba's grace, solidified his faith. He realized that the dream "punishment" was actually a beneficial act of healing, demonstrating how Baba's "inconceivable and unfathomable" methods work beyond normal understanding, rewarding the devotee's surrender.