Based on Chapter 10, what is the role and power of a Sadguru in a devotee's life?

According to Chapter 10, the Sadguru is presented as the one eternal God who holds immense power to transform a devotee's life. The text states that by placing faith in the Guru's feet, He can "strike a nail over the lines of destiny," effectively changing one's fate. The chapter further explains that the Sadguru acts as a boatman, guiding devoted followers across the "ocean of existence" (Bhavasagar). For those with pure devotion, the Guru can destroy worldly existence (Samsara), grant liberation (Moksha), and even destroy accumulated (Sanchit) and current (Kriyaman) karmas, making the difficult spiritual path effortless.