Can you summarize the primary purpose and nature of the Sadguru as explained in Chapter 16?

Chapter 16 of Sai Satcharitra portrays the Sadguru as a being who has taken a physical body specifically for the purpose of helping others and uplifting the poor and lowly. He is described with lofty titles such as Stainless (Niranjana), Imperishable (Avyaya), and One beyond attributes (Gunatita). Though he is an ocean of Truth, Consciousness, and Bliss who has no regard for mere outward rituals, he enjoys them with deep satisfaction when they are performed with sincere faith. Ultimately, the Sadguru's purpose is to impart knowledge to the ignorant and guide them towards union with Brahman through humble service.