What surprising instruction did Sai Baba give Das Ganu to resolve his doubt about the Upanishad?

When Das Ganu approached Sai Baba in Shirdi feeling troubled by a doubt he encountered while writing his commentary on the Ishavasya Upanishad, Baba's response was quite unexpected. As detailed in Chapter 20, instead of providing a direct explanation or discourse on the scripture, Baba simply told him not to worry. He prophesied that the resolution for Ganu's specific doubt would be delivered by a humble maidservant working at Kaka's house when Ganu returned there. This sets up the unfolding of a lesson through an unlikely source, a common theme in Baba's teachings.