Chapter 18 mentions the 'Unperceivable One' that the Vedas and Shrutis debate. What is the Sadguru's role in relation to this ultimate reality?

Chapter 18 emphasizes the Sadguru's critical role in making ultimate reality accessible. It states that the very "Unperceivable One" which the Vedas and Shrutis debate day and night is something the Guru points out "with a finger, effortlessly, to His devotees." This suggests that while scriptures and philosophical inquiry can endlessly discuss the nature of Brahman, the Sadguru provides a direct, experiential path that transcends intellectual debate. He is presented as the ultimate teacher of Self-knowledge, capable of making the abstract concept of the divine a tangible experience for the sincere seeker.