How does Chapter 10 describe the role and power of a Sadguru like Sai Baba in a devotee's life?

According to Chapter 10, the Sadguru is presented as the "one eternal God" who holds the power to fundamentally alter a devotee's life. The text states that by placing faith in His feet, He can "strike a nail over the lines of destiny," effectively changing one's fate. Furthermore, the chapter explains that pure service to the Sadguru completely destroys the worldly existence (Samsara) and helps devotees cross the three types of miseries. By His mere sight, the knots of the heart are broken, attachments vanish, and both accumulated (Sanchit) and current (Kriyaman) karmas are destroyed, ultimately leading the devotee towards liberation.