What does Chapter 25 teach about the concept of 'one-pointed devotion' and its relationship with the Sadguru?

Chapter 25 explains that Sai Baba, as the supreme embodiment of mercy, desires 'one-pointed devotion' above all else. To clarify this concept, the text references Krishna's words to Uddhava: "The Sadguru is indeed My own form." Therefore, the chapter posits that one-pointed devotion is the act of worshipping the Sadguru with love, recognizing him as the manifest incarnation of God. It is through this unwavering and focused faith in the Sadguru that a devotee lacks nothing in attaining their desires, as Sai wards off their misfortunes and removes their suffering.