How did Sai Baba use the act of serving tea to confirm Cholkar's faith?

Sai Baba's instruction to serve tea was a masterful and personal demonstration of his omniscience, designed to confirm Cholkar's faith, as chapter 15 explains. Cholkar had secretly given up sugar as a penance for delaying his vow. When he finally visited Shirdi and was a guest of a man named Jog, Baba told Jog to give Cholkar 'cups of tea, well-filled with sugar.' This was deeply meaningful because Baba himself did not drink tea, and more importantly, it directly addressed Cholkar's private, unvoiced act of renunciation. This specific and seemingly random command was a clear sign from Baba that the vow, the delay, and the secret penance were all known to him, which amazed Cholkar and solidified his devotion.