What was the specific project Das Ganu was working on, and what was the main difficulty he encountered?

As detailed in Chapter 20, Das Ganu had undertaken the project of creating the "Ishavasya-Bhavartha-Bodhini," a commentary on the Ishavasya Upanishad. His goal was to make this scripture, which is full of deep meanings, accessible to those ignorant of the Sanskrit language by translating it word for word and explaining it in simple Prakrit Ovi verses. His main difficulty was that despite his literal translation, he could not grasp the "internal secret" or profound essence of the text. Consequently, his "mind found no joy" in the work, which prompted him to seek guidance from Sai Baba.