What is the meaning of the phrase 'strikes a nail over the lines of destiny' as used in Chapter 10?

In Chapter 10, the phrase 'strikes a nail over the lines of destiny' is a powerful metaphor for the Sadguru's ability to change a devotee's fate. As stated in chunks 0 and 1, this happens when a person places their faith completely in the Guru's feet. The saying implies that destiny, which might seem fixed and unchangeable, can be fundamentally altered by the Guru's grace. The chapter establishes the Guru as the 'one eternal God,' whose power transcends ordinary limitations. Therefore, this phrase highlights a core teaching: sincere devotion to the Sadguru can override the karmic course of one's life, leading to a new, divinely-guided outcome.