What does Chapter 10 say about the power of a Sadguru and its effect on a devotee's karma and destiny?

Chapter 10 powerfully illustrates the supreme role of the Sadguru in a devotee's life. It states that by placing faith in the Guru's feet, he can change one's fate, poetically described as "striking a nail over the lines of destiny." The chapter further explains that the Sadguru acts as a boatman to help devotees cross the ocean of existence (Bhavasagar). Through the Guru's grace and even just his sight, the knots of the heart are broken, attachment to worldly objects vanishes, and most importantly, both accumulated (Sanchit) and current (Kriyaman) karmas are destroyed, leading the devotee effortlessly towards liberation.