What are some of the key attributes and descriptions used for the Sadguru in the introductory part of Chapter 16?

The introduction to Chapter 16 uses several profound terms to describe the Sadguru's essential nature. He is called "Niranjana" (the Stainless), "Avyaya" (the Imperishable), and "Gunatita" (the One beyond attributes). The text describes him as an "ocean of Truth, Consciousness, and Bliss" and refers to him as 'Aptakama,' one whose desires are always fulfilled. His speech is likened to the sweet nectar from the ocean of Vedanta. This chapter portrays him as the Lord of the Empire of Self-Bliss, whose very presence causes the six enemies like lust and anger to vanish.