Can you tell me the story Baba shared about why faith and patience are so important?

Sai Baba explained his teachings through a story about his own Guru. As recounted in Chapter 19, his Guru, a great saint, shaved Baba's head and asked for two paise. Baba gave them immediately. He later revealed that these were not ordinary coins, as his Guru had no need for money. The two paise he offered were "Faith (Nishtha) and Patience (Saburi)." By giving these two virtues to his Guru, Baba explains that his "Guru-Mother was pleased with me," highlighting them as the fundamental offerings a disciple must make.