Why was the miracle of the seedless grapes so impactful for Boss Dharamsee, especially compared to the experience of the other devotees present?

The miracle of the seedless grapes was profoundly impactful for Boss Dharamsee because it was a direct, personal response to his specific inner state of doubt. As Chapter 35 explains, Dharamsee arrived with a skeptical, "clinical" mindset. When Baba made him eat the grapes and they turned out seedless, it was a demonstration that Baba knew his specific thoughts and his dislike. The impact was amplified when Dharamsee confirmed that another devotee, Tarkhad, received normal grapes with seeds. This personalization of the miracle shattered Dharamsee's ego and proved that Baba was directly engaging with and responding to his mind, which is why it created such a firm determination in him.