Why did Cholkar give up eating sugar, and how did Baba show him that He knew about this secret act of devotion?

After Cholkar's wish to pass his exam was granted, he experienced a delay in fulfilling his vow to visit Shirdi due to financial difficulties. As a personal penance for this delay, Chapter 15 states that he gave up sugar entirely, even drinking his tea without it. When he finally reached Shirdi and was a guest of Jog, Baba demonstrated His omniscience in a remarkable way. Baba specifically told Jog to give Cholkar "cups of tea, well-filled with sugar." This instruction stunned Cholkar, as it was a clear sign that Baba was intimately aware of his secret renunciation and the reasons behind it.