How did Sai Baba use a simple cup of tea to demonstrate his omniscience to Cholkar?

When Cholkar finally arrived in Shirdi and was visiting with Jog, Sai Baba revealed his divine knowledge in a subtle yet powerful way. As detailed in Chapter 15, Baba, who did not drink tea himself, specifically instructed Jog to give Cholkar "cups of tea, well-filled with sugar." This instruction stunned Cholkar because it directly referenced his secret penance of avoiding sugar during the delay in fulfilling his vow. This meaningful act proved to Cholkar that Baba was aware of every detail of his vow, the delay, and his private sacrifice, thereby confirming his faith and bringing tears of joy to his eyes.