What was Das Ganu's project, and what specific difficulty did he face according to Chapter 20?

According to Chapter 20, the devotee Das Ganu had undertaken a project to create a commentary on the Ishavasya Upanishad, which he called the "Ishavasya-Bhavartha-Bodhini." His noble goal was to explain the meaning of this scripture in simple Prakrit language for those who were not proficient in Sanskrit. However, he encountered a significant obstacle. Although he translated the text word for word, he felt that he could not grasp its "internal secret" or deep essence. This lack of profound understanding left his mind without joy or satisfaction in his work, which prompted him to seek guidance from his Satguru.