How does Chapter 18 describe the nature and role of the Sadguru?

Chapter 18 extols the Sadguru as the supreme, eternal truth of Brahman, who is both beginningless and endless. The text presents the Guru as a being who transcends duality and illusion, showing the world to be an illusion through direct experience. According to Chapter 18, the Sadguru's role is to act as the teacher of the knowledge of the Self, effortlessly pointing out the 'Unperceivable One' that scriptures endlessly debate. This chapter also compares the Guru to monsoon rain clouds, showering the water of self-bliss with love upon devotees.