What does Chapter 18 say about the Guru's ability to reveal profound spiritual truths?

According to Chapter 18, the Sadguru possesses the remarkable ability to make the unperceivable perceptible to his devotees. The text highlights that the Guru, with effortless grace, can point out with a finger the very essence of Brahman, a concept that even the Vedas and Shrutis debate endlessly. Furthermore, Chapter 18 explains that when one is fortunate enough to fall within the Guru's grace, the false logic of 'mine' and 'thine' (this one is ours, that one is a stranger) completely vanishes. This demonstrates the Guru's power to impart supreme knowledge and dissolve dualistic thinking.