Based on Chapter 51, what is the connection between past merits (purva punya), the grace of a Sadguru, and a disciple's spiritual progress?

Chapter 51 presents a clear spiritual progression where past merits are the foundation for a disciple's journey. The text states that "Due to the merits of past lives, the grace of the Supreme Lord is obtained." This divine grace, in turn, is what leads an individual to a meeting with a Sadguru. The role of the Sadguru is then to foster the disciple's spiritual well-being and "strengthen the bliss of the disciple." This entire process, as framed in Chapter 51, culminates in the destruction of delusion, linking a devotee's positive karma from previous existences directly to receiving the Guru's guidance and achieving spiritual clarity.