What difficulty did Das Ganu encounter while writing his commentary on the Ishavasya Upanishad, and what was Sai Baba's advice?

According to Chapter 20, Das Ganu undertook the task of creating a commentary, the 'Ishavasya-Bhavartha-Bodhini,' to make the Upanishad accessible. Although he translated the text word for word, he found no joy because he could not grasp its 'internal secret' or deep meaning. Feeling stuck, he took his doubt to Sai Baba in Shirdi. Instead of giving a direct explanation, Baba told him something profound. As the chapter recounts, Baba's words were: "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house when you return there." This advice highlighted that spiritual understanding can come from unexpected sources through the Guru's grace.