Why did Cholkar give up sugar, and how did Sai Baba show that He was aware of this personal sacrifice?

After Cholkar's wish was granted and he passed his exam, there was a delay in his fulfillment of the vow to visit Shirdi. Chapter 15 explains this was due to the difficulty of overcoming "home expenses," described as a "threshold-ghat" that is very hard for a worldly man to cross. As a form of penance for this delay, Cholkar decided to abstain from sugar, even drinking his tea without it. When he finally arrived in Shirdi, Sai Baba demonstrated his omniscience by telling Mr. Jog, Cholkar's host, to give him "cups of tea, well-filled with sugar." This specific instruction showed Cholkar that his secret sacrifice was known and accepted by Baba, bringing tears of joy to his eyes.