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

According to Chapter 10, the Sadguru is paramount, described as the "one eternal God" while other gods are illusory. By placing faith in the Guru's feet, a devotee can have their fate changed, an act described as striking "a nail over the lines of destiny." The chapter further explains that pure service to the Sadguru completely destroys the worldly existence (Samsara) without needing intellectual acrobatics. The Guru acts as a boatman, helping devoted bhaktas cross the three types of miseries and the ocean of existence itself. This guidance leads to the effortless attainment of liberation, or Moksha.