The text says the Guru can 'strike a nail over the lines of destiny.' What does this mean, and what other effects does devotion to the Guru have on a person's life and karma?

According to Chapter 10, the phrase 'strikes a nail over the lines of destiny' signifies that the Guru possesses the divine power to change a person's fate. By placing sincere faith in the Sadguru's feet, a devotee can alter their predetermined destiny. This chapter further explains that pure service to the Sadguru completely destroys the cycle of worldly existence (Samsara) and helps devotees overcome physical, mental, and divine miseries. His mere sight can break the knots of the heart, eliminate attachments to sense objects, and even destroy both accumulated (Sanchit) and current (Kriyaman) karmas, ultimately leading to liberation, or Moksha.