How did Sai Baba reveal to Cholkar that He was aware of his secret vow and personal sacrifice?

Sai Baba revealed his knowledge of Cholkar's secret in a subtle yet powerful way, as narrated in Chapter 15. After Cholkar had his darshan, fulfilled his vow by distributing sugar, and was about to leave with his host, Mr. Jog, Baba specifically called out to Jog. He instructed him, 'Give him cups of tea, well-filled with sugar.' This command was profoundly meaningful because Cholkar had just ended his long period of abstaining from sugar. The text notes that Cholkar was amazed and tears of joy filled his eyes, as he instantly understood that Baba was confirming that his secret vow and the subsequent penance were known and fully accepted.