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

Chapter 20 strongly emphasizes the indispensable role of a Guru for spiritual comprehension. The text argues that the Upanishads hold the essence of the Vedas but are incredibly difficult to grasp without the grace of both God (Hari) and the Guru. It explicitly states that a scholar who believes they can comprehend these texts through their own efforts will fail, even after an entire era, because the 'hidden truth does not come to hand' without a Guru's guidance. In contrast, Chapter 20 assures that for a devotee who is 'attached to the Guru's feet,' there is no difficulty, and the hidden meaning reveals itself automatically. This illustrates that humility and devotion to a Guru are paramount over intellectual prowess.