Based on this chapter, what is the significance of the Sadguru and what benefits do devotees receive by having faith in him?

According to Chapter 10, the Sadguru is paramount, described as the 'one eternal God' in contrast to other illusory gods. By placing faith in the Guru's feet, a devotee can have their destiny changed, as He 'strikes a nail over the lines of destiny.' The chapter further explains that the Sadguru acts as a boatman, helping devotees cross the 'ocean of existence' (Bhavasagar). His sight alone can break the knots of the heart, remove attachment to sense objects, and destroy both accumulated (Sanchit) and current (Kriyaman) karmas, ultimately bestowing liberation effortlessly.