What does Chapter 20 say about the importance of a Guru for understanding profound scriptures like the Upanishads?

Chapter 20 strongly emphasizes the indispensable role of a Guru in comprehending profound spiritual texts. It uses Das Ganu's struggle with the Ishavasya Upanishad as a prime example. The chapter states that the Upanishads contain the essence of the four Vedas and are very difficult to grasp without the grace of both Hari (God) and a Guru. The text explicitly warns that a scholar's own efforts are insufficient to uncover the hidden truth, calling the path 'difficult at every step' without a Guru's grace. Conversely, as mentioned in Chapter 20, for a devotee who is attached to the Guru's feet, there is no difficulty, and the hidden meaning opens up automatically.