What does Chapter 10 teach about the power and role of a Sadguru in a devotee's life?

Chapter 10 presents the Sadguru as the ultimate spiritual guide and savior. It states that by placing faith in the Guru's feet, He can change one's fate, metaphorically "striking a nail over the lines of destiny." The chapter teaches that the Sadguru is the "one eternal God" amidst worldly illusions and that serving Him destroys the cycle of worldly existence (Samsara). A Sadguru acts as a boatman, helping devotees cross the ocean of existence and overcome physical, mental, and divine miseries, ultimately granting liberation (Moksha) effortlessly.