How did Sai Baba prove his omniscience to his devotee Cholkar through an offering of tea?

Sai Baba demonstrated his omniscience to Cholkar in a remarkable way. Cholkar had taken a private vow to abstain from sugar until he could visit Shirdi. After finally arriving and fulfilling his vow, he was a guest of another devotee, Jog. As described in Chapter 15, Sai Baba, who did not drink tea himself, specifically instructed Jog to give Cholkar "cups of tea, well-filled with sugar." This instruction stunned Cholkar, as it revealed that Baba was intimately aware of his secret vow and the personal sacrifice he had made. The act served as a clear sign that his devotion was seen and his vow was accepted, confirming Baba's all-knowing nature.