What does this chapter teach about the concept of one-pointed devotion and the role of a Sadguru?

Chapter 25 explains that Sai Baba is the 'supreme embodiment of mercy' who desires 'one-pointed devotion' from his followers. It posits that a devotee who is faithful and filled with such devotion will lack nothing in attaining their desires. The text reinforces this by quoting Krishna's words to Uddhava: 'The Sadguru is indeed My own form,' establishing that worshipping a Sadguru with love is the very definition of one-pointed devotion. The chapter promises that once a devotee establishes this singular faith, the Guru, as an 'Ocean of Mercy,' will ward off all their misfortunes, grant their desired objects, and remove their suffering, effectively burning away the sins of the age.