Based on the introductory verses of Chapter 12, how is Sadguru Sainath described and what is the purpose of His incarnation?

Chapter 12 begins with salutations to Sadguru Sainath, describing Him as the embodiment of Truth, Consciousness, and Bliss. He is praised as the source of joy who can still the waves of worldly existence and remove the obsession with duality even from the dull-witted. The chapter poetically states that just as the sky expands to fill all places, so is His form depicted, a vision experienced only by the virtuous and fortunate. The text further explains that Sai, as a saint, incarnated for the sake of His devotees, serving as a king of knowledge personified and seated in the light of absolute liberation.