Based on Chapter 20, what is the importance of a Guru in understanding complex spiritual texts?

Chapter 20 strongly emphasizes that a Guru's grace is indispensable for comprehending profound spiritual knowledge. The text explains that the Upanishads, containing the essence of the Vedas, are incredibly difficult to grasp without the grace of God and Guru. It explicitly states that a scholar relying solely on their own efforts will fail to uncover the hidden truth, even over an entire era, because the path is difficult at every step. However, as this chapter illustrates, for a devotee who is humble, detached, and attached to the Guru's feet, the hidden meaning opens up automatically, making the science of Self-knowledge accessible.