According to Chapter 20, what is the role of a Guru in understanding complex scriptures like the Upanishads?

Chapter 20 strongly emphasizes the indispensable role of a Guru for spiritual understanding. The text explains that scriptures like the Upanishads, which are the essence of the Vedas, are incredibly difficult to grasp without divine grace. It states that a scholar's own efforts, no matter how great, will fail to reveal the hidden truth without the Guru's guidance. As mentioned in this chapter, for one who is attached to the Guru's feet, the hidden meaning opens up automatically. This 'science of Self-knowledge' is described as a weapon that cuts through birth and death, and only the humble and detached are deemed worthy of it.