What does Chapter 10 reveal about the spiritual power of a Sadguru and the benefits of devotion?

Chapter 10 teaches that the Sadguru is the one eternal God, distinct from other illusory gods. By placing faith in his feet, a devotee can have their destiny changed, as the Guru "strikes a nail over the lines of destiny." The chapter further explains that for those with pure devotion, the Sadguru acts as a boatman, helping them cross the ocean of worldly existence (Bhavasagar) and overcome physical, mental, and divine miseries. Seeing this faith, the Guru bestows Knowledge and the bliss of liberation (Moksha) effortlessly, destroying accumulated and current karmas.