How did Sai Baba use a simple thing like grapes to change a skeptic's mind?

Sai Baba demonstrated his divine insight and power through a simple offering of grapes to a skeptical visitor named Boss Dharamsee. As recounted in Chapter 35, Dharamsee, who was curious about the miracles he had heard about, was offered grapes with seeds, which he disliked and was forbidden by his doctor to eat unwashed. His mind was filled with doubt, even questioning Baba's sainthood for not knowing his preference. However, when Baba insisted he eat them, Dharamsee discovered they had miraculously become seedless. This personal and undeniable miracle shattered his ego and clinical scrutiny, transforming his doubt into profound love and devotion for Sai.