What did Sai Baba identify as the two most essential qualities for a disciple to possess?

Sai Baba taught that the two most crucial qualities for any disciple are Faith (Nishtha) and Patience (Saburi). In Chapter 19, he shares a story about his own Guru, who once asked him for two paise. Baba clarifies that this was not a request for money, but a lesson. He explains, "Faith (Nishtha) and Patience (Saburi)—these were the two paise, nothing else; I gave them to him then and there, and thus my Guru-Mother was pleased with me." He further emphasizes their importance by describing them as "two sisters, dear as life to each other." The text reinforces that even a powerful Guru ultimately seeks these two qualities from a devotee: "strong faith at the Guru’s feet and the strength of courage which is patience."