How does Chapter 10 describe the power of a Sadguru in a devotee's life?

Chapter 10 of the Shri Sai Satcharitra explains that a Sadguru holds immense power to transform a devotee's life. By placing faith in the Guru's feet, one's fate can be changed, as if a 'nail is struck over the lines of destiny.' The text states that pure service to the Sadguru can completely destroy the cycle of worldly existence (Samsara) and help devotees cross the three types of miseries. The Sadguru is compared to a boatman who safely guides followers across the ocean of existence, bestowing knowledge and liberation effortlessly.