Can you explain the specific literary project Das Ganu was working on and the main obstacle he faced?

Das Ganu's project, as mentioned in Chapter 20, was a commentary called the "Ishavasya-Bhavartha-Bodhini." His intention was to create an explanation of the Ishavasya Upanishad in simple Prakrit language, using Ovi verses, to make its meaning accessible to people who were ignorant of the Sanskrit language. His main obstacle was that even though he had translated the text word for word, he couldn't grasp its deeper, internal secret. The text states that "without understanding the internal secret, the mind found no joy," indicating his work felt superficial and he was stuck on a profound doubt.