Can you explain the story of Boss Dharamsee and the grapes? What was the lesson?

In Chapter 35, we learn about Boss Dharamsee, who visited Shirdi with a skeptical attitude. When Kaka offered grapes with seeds to Sai Baba, Baba began distributing them. Dharamsee, who disliked seeded grapes and was worried they were unwashed, mentally challenged Baba's omniscience. He thought, "If he is a saint, how does he not know that I do not like these grapes?" In response, Baba gave him even more. When Dharamsee finally ate them at Baba's command, he was astonished to find they were seedless. However, when he asked another devotee, Babasaheb Tarkhad, his grapes had seeds. This miracle shattered Dharamsee's "clinical scrutiny" and ego, leading to the birth of love and devotion for Sai in his heart. The lesson is that Baba's ways are mysterious and he often works through direct experience to turn doubt into faith.