How did Sai Baba manage to change Boss Dharamsee's skeptical attitude into one of devotion?

Boss Dharamsee's transformation from skeptic to devotee was a direct result of a personalized miracle that addressed his specific internal state. As described in Chapter 35, he arrived with a sense of "clinical scrutiny" and was immediately troubled by the grapes offered by Baba, which he disliked. His mind filled with doubt, wondering why a saint wouldn't know his preference. Instead of accommodating his dislike, Baba intensified the test by giving him more grapes. The turning point occurred when Dharamsee, upon Baba's command, obeyed and ate them, only to find them miraculously seedless. Chapter 35 states this experience stunned him, causing his ego to drop away and be replaced by love for the saint and a firm determination to return.