Could you narrate the entire story of Cholkar's vow, from its inception to the lesson he learned from Sai Baba?

The story of Cholkar, found in Chapter 15, begins with him, a poor man, making a vow to offer sugar candy to Sai Baba if he passes a crucial job examination. Upon succeeding, he faced financial difficulties that delayed his journey to Shirdi. During this time, he gave up sugar as a personal penance. When he finally reached Shirdi and fulfilled his vow, he was a guest of Jog. It was then that Baba miraculously told Jog, "Give him cups of tea, well-filled with sugar." This stunned Cholkar, proving Baba knew of his secret sacrifice. Baba then explained His omnipresence, stating, "My home is in your heart; I am your inner self," teaching Cholkar that Baba is always with his devotees, residing in the hearts of all beings.