How did Sai Baba prove to Cholkar that he was aware of his personal sacrifices?

Sai Baba provided a powerful and personal sign to prove his omniscience to Cholkar. As narrated in Chapter 15, after Cholkar had finally made his pilgrimage to Shirdi and fulfilled his vow of distributing sugar, he was with his host, Jog. As they were about to leave, Baba specifically instructed Jog, "Give him cups of tea, well-filled with sugar." This instruction was deeply meaningful because Cholkar had secretly given up sugar as a personal penance while he was waiting to fulfill his vow. Baba did not drink tea Himself, so this sudden request was clearly for Cholkar's benefit, designed to show that his secret renunciation was known to Baba and that his devotion was accepted, which left Cholkar amazed and filled with tears of joy.