What is the philosophical stance of Chapter 20 regarding the ability to understand profound texts like the Upanishads without a Guru?

Chapter 20 presents a strong philosophical argument about the necessity of a Guru for true understanding. It states that the Upanishads, which hold the essence of the Vedas, are very difficult to grasp without the grace of God and Guru. The text explicitly warns that a scholar who arrogantly believes they can comprehend these scriptures through their own efforts will never succeed, as the hidden truth remains elusive. Conversely, for one who is humble, detached, and devoted to the Guru's feet, the path becomes easy, and the hidden spiritual meaning reveals itself automatically.