How does Chapter 10 explain the role of a Sadguru in a devotee's life?

Chapter 10 powerfully illustrates the role of the Sadguru as an essential guide for crossing the 'ocean of existence.' The text states that by placing faith in the Guru's feet, He can change one's fate, an act described as striking 'a nail over the lines of destiny.' The Sadguru is presented as a boatman who helps devoted bhaktas overcome the three types of miseries—physical, mental, and divine. Furthermore, Chapter 10 explains that when the Guru sees the devotion and faith of a devotee, He bestows Knowledge (Samvitti) and the attainment of liberation (Moksha) effortlessly, destroying worldly existence (Samsara) for them.