What is the significance of offering something to a Guru, and how does the story of the grapes illustrate this?

The Satcharitra suggests that it is good practice not to go empty-handed when visiting a Guru. Chapter 35 illustrates this when the devotee Kaka buys grapes to present to Sai Baba. This act of offering is a gesture of respect and devotion. The significance is shown in how Baba then uses this simple offering as a medium for a profound teaching and miracle. The grapes Kaka brought, though the common seeded variety, became the very tool Baba used to transform the skeptical heart of Boss Dharamsee. This demonstrates that the value is not in the material worth of the gift, but in the devotional act itself, which the Guru can then utilize for the spiritual benefit of others.