What vow did Cholkar make to Sai Baba, and how did Baba eventually show him that the vow was accepted?

Cholkar, facing a crucial examination to make his job permanent, made a vow to Sai Baba. As described in Chapter 15, he promised that if he passed by Baba's grace, he would visit Shirdi and distribute sugar candy (khadisakhar) in Baba's name. After passing, financial difficulties delayed his trip, during which time he gave up sugar as a personal penance. When he finally reached Shirdi and fulfilled his vow, Baba demonstrated his omniscience. He instructed another devotee, Jog, to give Cholkar "cups of tea, well-filled with sugar." This specific instruction amazed Cholkar, as it proved Baba knew about his secret, personal sacrifice of abstaining from sugar, confirming that his devotion and vow had been fully accepted.