How did Sai Baba demonstrate his omniscience to the skeptical Boss Dharamsee?

Sai Baba demonstrated his omniscience through a remarkable miracle involving grapes. As narrated in Chapter 35, a skeptical visitor named Boss Dharamsee internally questioned Baba's sainthood because he was offered grapes with seeds, a variety he disliked. Dharamsee thought to himself, "If he is a saint, how does he not know that I do not like these grapes?" In direct response to this unspoken thought, Baba not only gave him more grapes but then commanded him to eat them. When Dharamsee complied, he was astonished to find the grapes in his mouth were completely seedless, proving Baba knew the deepest intent of his mind and could alter reality to teach him a lesson in faith.