I read that it's important not to visit a Guru empty-handed. How does the story in Chapter 35 illustrate this principle?

Chapter 35 explicitly states the principle that 'It is not good to go empty-handed to the door of God, a priest, or a Guru.' This is immediately put into practice by the devotee Kaka, who buys two seers of grapes on his way to see Baba in Shirdi. This simple act of devotion, offering what was available even if it wasn't the 'seedless variety,' becomes the very catalyst for a profound teaching and miracle. Baba uses these specific grapes to interact with the skeptical Boss Dharamsee. Kaka's offering provided the medium through which Baba could demonstrate his divine knowledge and power, ultimately transforming Dharamsee's heart. This shows that the devotee's offering, no matter how humble, creates an opportunity for the Guru to bestow grace and impart spiritual lessons.