How did Sai Baba reveal his awareness of Cholkar's secret personal sacrifices?

Sai Baba demonstrated his omniscience in a subtle yet powerful manner. As detailed in Chapter 15, after Cholkar finally arrived in Shirdi and fulfilled his vow of distributing sugar, he went to stay with another devotee named Jog. At that moment, Baba specifically instructed Jog to give their guest 'cups of tea, well-filled with sugar.' This was a deeply meaningful command because, due to the long delay in fulfilling his original vow, Cholkar had secretly undertaken a personal penance of renouncing sugar entirely. Baba's specific mention of adding sugar to the tea was a direct sign to Cholkar that his private sacrifice was known to Baba, which brought tears of joy to Cholkar's eyes and solidified his faith.