Based on Chapter 20, what is the significance of a Guru in understanding profound spiritual texts like the Upanishads?

Chapter 20 strongly emphasizes the indispensable role of a Guru for spiritual understanding. The text states that the Upanishads, containing the essence of the Vedas, are incredibly difficult to grasp without the grace of God and the Guru. It explicitly refutes the idea that a scholar can comprehend these hidden truths through their own efforts, claiming such a task is impossible without a Guru's grace. For a devotee who is humble, detached, and attached to the Guru's feet, the path becomes easy. As the chapter explains, for such a person, the hidden meaning of scriptures opens up automatically, making the Guru the key to unlocking profound spiritual wisdom.