According to Chapter 25, what is the importance of one-pointed devotion to Sai Baba, and what are its rewards?

Chapter 25 emphasizes that Sai Baba is the supreme embodiment of mercy who desires only "one-pointed devotion" from his followers. This form of devotion is described as worshipping the Sadguru with love, recognizing him as the form of God. The chapter states that a devotee who is faithful and filled with this unwavering devotion lacks nothing in attaining their desires. Specifically, it promises that once one-pointed faith is established, Sai wards off all misfortunes, removes suffering, and grants the desired objects of that devotee, showcasing his immense love and mercy.