What challenge did Das Ganu face while writing his commentary on the Ishavasya Upanishad, and how did Sai Baba guide him?

Chapter 20 explains that Das Ganu was working on a commentary called "Ishavasya-Bhavartha-Bodhini" to make the profound teachings of the Ishavasya Upanishad accessible to people unfamiliar with Sanskrit. Although he managed a word-for-word translation into simple Prakrit language, he found himself unable to grasp the deeper, internal secret of the scripture, which left his mind without joy or satisfaction. Seeking a solution, he went to Shirdi. Sai Baba, in his characteristic way, provided guidance by telling Das Ganu that the resolution to his doubt would come from an unexpected source: the maidservant at Kaka’s house upon his return.