How do the opening verses of Chapter 18 establish the philosophical identity of the Sadguru?

The introductory verses of Chapter 18 establish a profound philosophical identity for the Sadguru by equating him with the highest spiritual realities. The chapter opens by hailing the Sadguru as 'the supreme Eternal one' and 'the Truth of Brahman,' immediately elevating him beyond a physical form to the level of the absolute. It further describes him as the 'Ruler of Maya,' who demonstrates the illusory nature of the world through direct experience. By proclaiming victory to the one who is 'Beginningless and Endless' and 'beyond duality,' the text from Chapter 18 aligns the Sadguru with the core tenets of non-dual philosophy, presenting him as the ultimate teacher of Self-knowledge who can effortlessly reveal the 'Unperceivable One' that the Vedas endlessly debate.