The Satcharita mentions it's not good to go empty-handed to a Guru. Can you explain this concept using the story of Kaka and Dharamsee's visit to Shirdi?

Chapter 35 illustrates the principle of not approaching a Guru, God, or priest empty-handed. Before visiting Sai Baba, a devotee named Kaka made it a point to purchase two seers of grapes to offer. This act is presented as the proper conduct. Kaka placed the offering at Baba's feet, and Baba then began distributing the grapes as prasad. This story emphasizes that an offering, no matter how simple, is a gesture of respect and love. It's not about the material value but the intention behind it. The subsequent miracle involving Boss Dharamsee, who was initially skeptical, unfolded with these very grapes, showing how a humble offering can become the medium for the Guru's grace.