Can you explain the process of acquiring spiritual knowledge as described by Nana Chandorkar in his explanation of the Gita verse to Sai Baba?

In his dialogue with Sai Baba, as recounted in Chapter 39, Nana Chandorkar explains the method for acquiring true Knowledge based on a verse from the Gita. He outlines a three-fold path centered on the relationship with a Guru. The first step is prostration (pranipatena), which signifies humility and surrender. The second is respectful questioning (pariprashnena), showing a sincere desire to learn. The third is selfless service (sevaya), which demonstrates devotion and purifies the seeker. Nana explains that by following this path of humility, inquiry, and service, "the Wise who have seen the Truth will show you the path of Knowledge."