Can you explain the principle of making an offering to a Guru, using the story of the grapes from the texts?

Chapter 35 illustrates this principle beautifully. The text explicitly states, 'It is not good to go empty-handed to the door of God, a priest, or a Guru.' Following this tenet, a devotee named Kaka bought two seers of grapes to offer to Sai Baba. Though he couldn't find the seedless variety, he bought what was available. This simple act of offering, made with devotion, became the very instrument for one of Baba's profound miracles. The seeded grapes became the catalyst for transforming the skeptical Boss Dharamsee. This shows that the nature of the offering is less important than the sincere intention behind it, as the Guru can use any offering to bestow grace and teach a lesson.