According to Chapter 10, what is the role of the Sadguru and how can he impact a devotee's destiny and spiritual journey?

Chapter 10 describes the Sadguru as the "one eternal God" who holds the power to alter a devotee's fate, poetically stated as being able to "strike a nail over the lines of destiny." By placing faith in His feet and offering pure service, a devotee can have their worldly existence (Samsara) completely destroyed. The chapter explains that the Guru acts as a boatman, guiding followers across the three types of miseries and the ocean of existence (Bhavasagar). For those with sincere devotion, the Sadguru grants Knowledge (Samvitti) and the attainment of liberation (Moksha) effortlessly, demonstrating his profound impact on a devotee's spiritual path.