What does Chapter 10 reveal about the significance of the Sadguru in a devotee's life, especially in relation to fate and karma?

According to Chapter 10, the Sadguru plays a pivotal role in a devotee's spiritual journey, possessing the power to alter their very destiny. The text states that by placing faith in the Guru's feet, He "strikes a nail over the lines of destiny," effectively changing one's fate. Furthermore, this chapter explains that through the Guru's grace, the knots of the heart are broken and both accumulated (Sanchit) and current (Kriyaman) karmas are destroyed. The Sadguru is presented as the one eternal God, an essential boatman who guides devotees across the ocean of existence and delivers them from worldly miseries, ultimately granting liberation.