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

Chapter 25 explains that Sai Baba, as a 'supreme embodiment of mercy,' desires 'one-pointed devotion' from his followers. The text defines this devotion by citing Krishna's words to Uddhava: 'The Sadguru is indeed My own form.' Thus, to worship the Sadguru with love is the essence of one-pointed devotion. The chapter establishes a direct link between this faith and its rewards, stating that a 'devotee who is faithful and filled with devotion lacks nothing in attaining their desires.' It is through this established one-pointed faith, as described in Chapter 25, that Sai Baba is said to ward off misfortunes, remove suffering, and grant the desired objects of his devotees.