What are the profound effects of receiving a Guru's grace as detailed in the opening stanzas of Chapter 18?

The initial verses of Chapter 18 detail the profound and transformative effects of a Guru's grace. It states that through the Guru's experience, the world is revealed to be an illusion, hailing him as the "Ruler of Maya." A key effect mentioned in Chapter 18 is that when one is touched by the Guru's grace, the divisive and false logic of "mine" and "thine" completely vanishes. This signifies the eradication of the ego-driven distinctions that cause conflict. The chapter also notes that the Guru makes the Unperceivable One, which scriptures endlessly debate, perceivable to the devotee, effortlessly.