How did Sai Baba use the incident with the tea to prove his divine knowledge to Cholkar?

The tea incident is a pivotal moment in Cholkar's story, as described in Chapter 15. After Cholkar had fulfilled his secret vow regarding sugar, he was a guest at Jog's place. As he was leaving, Sai Baba gave a very specific instruction to Jog: "Give him cups of tea, well-filled with sugar." Since Baba himself did not drink tea, this request was highly unusual. Its true purpose, as the text explains, was to provide a clear sign to Cholkar. It demonstrated that Baba was intimately aware of Cholkar's private vow and the long penance he had endured. This confirmation that his vow was accepted brought Cholkar to tears and deeply strengthened his faith.