How does Chapter 10 describe the power of a Sadguru, like Sai Baba, to alter a devotee's life and destiny?

According to Chapter 10, the Sadguru possesses the profound ability to completely alter a devotee's life path. The text states that by placing faith in the Guru's feet, He can "strike a nail over the lines of destiny," which is interpreted as changing one's fate. Furthermore, the chapter explains that where the service to the Sadguru is pure, the entire worldly existence, or Samsara, is completely destroyed. The Guru acts as a boatman to help devoted bhaktas cross the three types of miseries and the greater ocean of existence, known as Bhavasagar. This illustrates the Guru's immense power to intervene and guide a devotee's destiny towards liberation.