Based on Chapter 20, what is the importance of having a Guru when trying to understand profound spiritual texts like the Upanishads?

Chapter 20 strongly emphasizes the indispensable role of a Guru in comprehending spiritual knowledge. It states that the Upanishads are the essence of the Vedas but are very difficult to grasp without the grace of both God (Hari) and a Guru. The text explicitly warns that a scholar's attempt to understand these texts through their own efforts alone is futile, as the "hidden truth does not come to hand" without Guru's grace. In contrast, this chapter explains that for a person who is humble, detached, and attached to the Guru's feet, there is no difficulty at all; the hidden meaning reveals itself automatically.