Based on Chapter 51, what is the relationship between 'rinanubandh', the merits of past lives, and meeting a Sadguru?

Chapter 51 explains a profound spiritual connection between past actions and present spiritual opportunities. It states that meeting a Sadguru and strengthening one's spiritual bliss is a direct result of obtaining the grace of the Supreme Lord, which itself is earned through the merits of past lives. The chapter introduces the concept of 'rinanubandh,' the bond of past lives, as the underlying reason for Kakasaheb's firm relationship with Sai and his establishment in Shirdi. This suggests that our connections with saints and holy places are not accidental but are preordained karmic ties from previous existences, as detailed in this chapter's introduction.