How does the story about the grapes demonstrate Baba's omniscience or ability to know people's inner thoughts?

The incident with Boss Dharamsee is a powerful demonstration of Sai Baba's omniscience. Chapter 35 reveals that as Dharamsee hesitated, he 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 internal, unspoken challenge, Baba gave him even more grapes, showing he was aware of the man's thoughts. The ultimate proof came when the grapes, which Dharamsee knew had seeds, turned out to be seedless in his mouth. Dharamsee himself acknowledged this, thinking, "Knowing the intent of my mind... Whatever Sai gives me, they turn out to be seedless and beneficial." The miracle was precisely tailored to address Dharamsee's specific, private thoughts of doubt and dislike.