How did Sai Baba specifically show Cholkar that He knew about his secret sacrifice?

Sai Baba demonstrated his omniscience to Cholkar in a subtle yet powerful miracle. After Cholkar finally reached Shirdi and fulfilled his vow by distributing sugar, he was visiting with another devotee named Jog. As Cholkar was about to leave, Sai Baba spoke to Jog and gave a very specific instruction: 'Give him cups of tea, well-filled with sugar.' As Chapter 15 recounts, this statement astounded Cholkar. Baba himself did not drink tea, so there was no ordinary reason for this request. It was a direct and unmistakable sign that Baba knew about Cholkar's secret vow to abstain from sugar during the long delay in his pilgrimage. This confirmation of Baba's intimate knowledge of his devotee's heart brought tears of joy to Cholkar's eyes.