How did Sai Baba prove to Cholkar that He was aware of his secret sacrifice?

Sai Baba provided proof of his omniscience to Cholkar in a subtle yet powerful manner. After Cholkar finally managed to visit Shirdi to fulfill his long-delayed vow of distributing sugar, he was a guest of a man named Jog. As they were about to leave, Baba specifically instructed Jog, 'Give him cups of tea, well-filled with sugar.' This instruction, as recorded in Chapter 15, was deeply meaningful because Cholkar had secretly given up sugar as a personal penance for the delay in fulfilling his vow. Baba did not normally drink tea, so this specific request at that exact moment served as a clear sign to Cholkar that his private sacrifice and the reasons for his delay were fully known to Baba, which brought tears of joy to Cholkar's eyes and solidified his faith.