Chapter 10 says the Guru 'strikes a nail over the lines of destiny.' What does this mean and how is it achieved?

The phrase 'strikes a nail over the lines of destiny' is a powerful metaphor used in Chapter 10 to explain the Guru's ability to change a devotee's fate. This profound change is not arbitrary; it is achieved by 'placing faith in His feet.' The chapter elaborates that where the 'service of the Sadguru is pure, the worldly existence (Samsara) is completely destroyed.' By trusting the Guru to be the 'boatman' across the 'ocean of existence,' a devotee can overcome the three types of miseries. Therefore, according to the text, unwavering faith and pure service to the Guru are the means by which one's predetermined destiny can be altered for the better.