The text mentions two stories about devotees and money. What is the underlying principle demonstrated by the story of Appasaheb and the Fakir?

The story of Appasaheb and the Fakir, found in Chapter 33, illustrates a profound principle about Sai Baba. When the Fakir took Appasaheb's ten-rupee note and returned the nine individual rupees he had been given, it wasn't a simple monetary exchange. The text explicitly states that the essence of this story is to show that Sai Baba ensures the complete fulfillment of whatever words a devotee utters. Appasaheb had offered to give more, and this unusual transaction was Sai's way of honoring that commitment, thereby demonstrating Sai's true principle of upholding his devotee's words.