Why did Cholkar stop eating sugar, and how did Sai Baba acknowledge this sacrifice?

Cholkar stopped eating sugar as a personal penance because he was unable to immediately fulfill a vow he had made to Sai Baba. As Chapter 15 explains, he had promised to distribute sugar candy upon passing an exam, but financial hardship prevented him from traveling to Shirdi. To maintain his resolve, he gave up sugar, even drinking his tea without it. Sai Baba acknowledged this secret sacrifice in a profound way. After Cholkar finally arrived in Shirdi and fulfilled his vow, Baba specifically instructed Mr. Jog to serve Cholkar 'cups of tea, well-filled with sugar.' This act amazed Cholkar, as it was a clear sign that Baba was aware of his private act of devotion and the reason behind it.