What does this chapter say about the importance of a Guru and what they can do for a devotee?

According to Chapter 10, the Guru is presented as the supreme, eternal God who can alter a person's destiny, described as striking "a nail over the lines of destiny." Pure service to the Sadguru is said to completely destroy the worldly existence (Samsara) without needing intellectual acrobatics. The text explains that a Guru acts as a boatman, helping devoted followers cross the "ocean of existence" and overcome the three types of miseries. For those with faith, the Guru effortlessly places Knowledge in their hands and grants liberation (Moksha), demonstrating the immense power and significance attributed to the Guru in a devotee's life.