According to the text, what is the Sadguru's role in revealing the ultimate truth to devotees?

The source text from Chapter 18 beautifully describes the Sadguru's role in guiding devotees toward ultimate truth. It states that the Guru, hailed as the "supreme Eternal one" and "Ruler of Maya," makes the Unperceivable One, which even the Vedas and Shrutis debate endlessly, known to devotees effortlessly, as if pointing with a finger. The chapter emphasizes that the Sadguru is the "teacher of the knowledge of the Self" and that through the Guru's grace, the false logic of "mine" and "thine" disappears, leading the seeker to a state beyond duality.