What surprising advice did Sai Baba give to Das Ganu to help him understand the Ishavasya Upanishad?

When Das Ganu came to Shirdi with a doubt about the deep meaning of the Ishavasya Upanishad, Sai Baba gave him very peculiar instructions instead of a direct explanation. As recorded in Chapter 20, Baba told him, "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house When you return there." This mystifying guidance, pointing towards an ordinary maidservant as the key to unlocking profound scriptural wisdom, sets the stage for the subsequent events in the Satcharitra, demonstrating Baba's unconventional teaching methods.