How does Chapter 10 explain the Sadguru's ability to alter a devotee's destiny and help them overcome life's struggles?

Chapter 10 profoundly explains the power of a Sadguru, like Sai Baba, to transform a devotee's life. It states that by placing faith in the Guru's feet, He can metaphorically "strike a nail over the lines of destiny," which means he has the power to change one's fate. The chapter uses the analogy of a boatman, explaining that just as one trusts a boatman to cross a worldly ocean, a devotee must trust the Guru to cross the ocean of existence, or Bhavasagar. According to Chapter 10, when a Sadguru becomes this boatman, the devotee can overcome the three types of miseries—physical, mental, and divine—and the worldly existence (Samsara) is completely destroyed.