How does Chapter 10 describe the Sadguru's power to change a devotee's destiny and help them overcome worldly struggles?

Chapter 10 powerfully illustrates the Sadguru's ability to alter a devotee's life and destiny. The text explicitly states that by placing faith in the Guru's feet, He "strikes a nail over the lines of destiny," which is interpreted as changing one's fate. Furthermore, Chapter 10 explains that for devoted bhaktas, the Sadguru acts as a boatman, helping them cross the "ocean of existence" (Bhavasagar) and overcome the three types of miseries. This service to the Sadguru is so potent that it is said to completely destroy the worldly existence (Samsara) without the need for complex intellectual pursuits.