Synthesizing the introduction of Chapter 51, what is the relationship between past merits, the role of a Sadguru, and the destruction of ignorance?

According to the introductory sections of Chapter 51, there is a direct causal link between one's past actions and their spiritual progress. The text posits that it is due to the "merits of past lives" that one obtains the grace of the Supreme Lord. This divine grace, in turn, manifests by leading the individual to a meeting with a Sadguru. The presence of the Sadguru strengthens the disciple's bliss. This entire process is aimed at the destruction of ignorance, also called delusion (moha), a theme Chapter 51 explores through the example of Krishna and Arjuna from the Gita. Therefore, the chapter suggests that past merits enable one to find a Guru, and the Guru's guidance, like the stories in the Sai Charitra, is the mechanism for purifying the self and destroying the delusion that obscures true knowledge.