How did the grape incident demonstrate Sai Baba's omniscience to Dharamsee?

The incident with the grapes served as profound proof of Sai Baba's omniscience for Boss Dharamsee. According to Chapter 35, while Dharamsee was silently troubled, he had the specific thought, "If he is a saint, how does he not know That I do not like these grapes?" Immediately following this internal doubt, Baba gave him even more grapes, directly responding to his unspoken challenge. Later, when Dharamsee was still hesitant, Baba explicitly told him to "Throw them in and eat." The ultimate proof came when the grapes, which he knew had seeds, turned out to be seedless in his mouth. Dharamsee himself concluded that Baba knew the "intent of my mind," realizing that the miracle was a direct and personal answer to his specific mental state and skepticism.