According to Chapter 25, what is the relationship between one-pointed devotion to a Sadguru and the fulfillment of a devotee's desires?

Chapter 25 explicitly states that there is a direct and powerful relationship between devotion and the fulfillment of one's needs. The text emphasizes that Sai Baba, as the Sadguru, "desires only one-pointed devotion." It assures the reader that a devotee who is "faithful and filled with devotion lacks nothing in attaining their desires." The chapter reinforces this by quoting Lord Krishna's words to Uddhava, "The Sadguru is indeed My own form," and explains that worshipping the Sadguru with love is the definition of one-pointed devotion. The text promises that once this faith is established, Sai "wards off all the misfortunes of that devotee" and "grants the desired objects and removes their suffering."