Can you summarize the main events and teachings described in Chapter 20?

Chapter 20 of the Sai Satcharitra presents two main scenes. First, it describes the loving atmosphere in Shirdi after the noon Aarti, where Sai Baba would distribute Udi to his devotees, applying it to their foreheads and affectionately sending them to eat. Second, it introduces the story of Das Ganu, who was struggling to understand the profound meaning of the Ishavasya Upanishad for his commentary. As this chapter explains, when Das Ganu sought help, Sai Baba prophesied that a maidservant would resolve his doubt, underscoring the teaching that divine wisdom can come from unexpected sources and that a Guru's grace is essential.