According to the events in Shirdi, what is the ultimate medicine for afflictions, and how is this demonstrated through the stories of Kaka and Dattopant?

The source text from Chapter 13 posits that the ultimate medicine for any ailment is not a physical substance but the grace of a saint, specifically their word and the prasad they offer. This principle is vividly illustrated in two stories. First, Kaka Mahajani's severe diarrhea was cured not by any conventional treatment but by eating roasted peanuts and drinking water given to him by Sai Baba during a fit of rage. Baba simply declared, "your diarrhea has stopped," and it was so. Similarly, Dattopant of Harda, who suffered from a stomach ache for fourteen years, was healed when Baba gave him Vibhuti as prasad. The text explicitly states that for those who accept what a saint gives as prasad, no other medicine is needed.