Can you explain the story of Das Ganu and his difficulty with the Ishavasya Upanishad as described in Chapter 20?

Chapter 20 of the Sai Satcharitra recounts the story of Das Ganu, who was attempting to write a commentary on the Ishavasya Upanishad in simple Prakrit language, called the 'Ishavasya-Bhavartha-Bodhini.' He found himself struggling because, although he could translate the words, he couldn't grasp the deep internal meaning and secret of the scripture, and his mind found no joy in the work. Realizing this difficulty, he took his doubt to Sai Baba in Shirdi. Baba, in his unique way, told Das Ganu that the resolution to his doubt would be provided by a maidservant at Kaka's house upon his return, setting the stage for a lesson on Guru's grace.