According to Chapter 10, what is the power of a Sadguru like Sai Baba over a devotee's destiny and suffering?

Chapter 10 explains that a Sadguru holds immense power to alter a devotee's life. It states that by placing faith in the Guru's feet, He can change one's fate, a concept poetically described as striking 'a nail over the lines of destiny.' The text further elaborates that where the service of the Sadguru is pure, the cycle of worldly existence is completely destroyed. The Sadguru acts as a boatman, helping devoted bhaktas cross over the three types of miseries—physical, mental, and divine. Ultimately, by seeing a devotee's faith, the Guru bestows knowledge and liberation effortlessly, demonstrating his profound ability to alleviate suffering and transform a follower's destiny.