I'm interested in the story about Das Ganu in Chapter 20. What was the book he was writing and what difficulty did he run into?

Chapter 20 recounts the story of Das Ganu, who had started writing a commentary titled 'Ishavasya-Bhavartha-Bodhini.' His goal was to explain the profound meaning of the Ishavasya Upanishad in simple Prakrit language, making it accessible to those who didn't know Sanskrit. As the chapter explains, Das Ganu managed to translate the text word for word. However, he faced a significant obstacle: he couldn't grasp the 'internal secret' or the deep, underlying meaning of the Upanishad. This lack of understanding left his mind without joy, prompting him to travel to Shirdi to seek a resolution for his doubt at Sai Baba's feet.