Can you explain the challenge Das Ganu faced with the Ishavasya Upanishad and how Sai Baba responded in Chapter 20?

Chapter 20 explains that Das Ganu was writing a commentary on the Ishavasya Upanishad in simple Prakrit language so it could be understood by those ignorant of Sanskrit. Despite translating it word for word, he could not grasp the internal secret or deep meaning, and his mind found no joy in the work. When he presented this doubt to Sai Baba in Shirdi, Baba told him not to worry and that the resolution to his doubt would be provided by a maidservant at Kaka's house upon his return.