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

According to Chapter 10, the power of a Sadguru is immense and transformative. The text states that by placing faith in the Guru's feet, He 'strikes a nail over the lines of destiny,' which means he can change one's fate. This chapter further explains that pure service to the Sadguru completely destroys the worldly existence (Samsara) and helps devotees overcome the three types of miseries. By seeing a devotee's faith, the Guru can grant them Knowledge (Samvitti) and the effortless attainment of liberation, or Moksha, as described in Chapter 10.