Based on this chapter, what is the connection between one-pointed devotion and the story of Damu Anna?

Chapter 25 establishes a direct link between the concept of one-pointed devotion and the life of Damu Anna. The chapter begins by stating that Sai desires "one-pointed devotion" and that a devotee with such faith "lacks nothing in attaining their desires." It then introduces the story of Damu Anna as a specific illustration of this principle. The text explicitly says, "Once one-pointed faith is established, Sai wards off all the misfortunes of that devotee." Damu Anna is described as "a devotee who was devoted to Sai's feet," and his story, including being blessed with sons, is presented as a demonstration of Sai's love and mercy for those who worship the Sadguru with such focused love.