What does Chapter 10 reveal about the power of a Sadguru and the benefits of placing faith in one?

According to Chapter 10 of the Shri Sai Satcharitra, a Sadguru holds immense power to alter a devotee's life. The text states that by placing faith in the Guru's feet, He can change one's fate, poetically described as striking "a nail over the lines of destiny." Furthermore, pure service to the Sadguru can completely destroy the cycle of worldly existence (Samsara) and help a devotee cross the three types of miseries. Upon seeing a devotee's faith, the Guru can grant Knowledge (Samvitti) and liberation (Moksha) effortlessly, breaking the knots of the heart and destroying accumulated and current karmas, as detailed in this chapter.