Why did Cholkar stop eating sugar, and what was the significance of this act in his story?

In the narrative from Chapter 15, Cholkar's decision to stop eating sugar was a self-imposed penance. After making a vow to distribute sugar candy upon passing an exam, he succeeded by Baba's grace. However, he was unable to travel to Shirdi immediately due to household financial pressures. Feeling distressed by this delay in fulfilling his promise to Baba, he gave up sugar entirely, even drinking his tea without it, as a sign of his unwavering commitment. The significance of this act is that it was a secret sacrifice known only to him. When Baba later specifically mentioned giving him tea 'well-filled with sugar,' it served as undeniable proof of Baba's omniscience and that He had accepted Cholkar's devotion and penance.