According to Chapter 22, what is the nature of the Sadguru in relation to reality, illusion, and devotion?

Based on the teachings in Chapter 22, the Sadguru's nature is all-encompassing and transcendent. He is described as the formless, supreme reality that exists beyond perception, but also as the creator of illusion (maya), symbolized by the snake-and-rope analogy. The chapter explains that He is the cause of the illusion and also the one who removes the resulting fear for his devotees. For the devotee, the Sadguru's feet are the ultimate path to happiness and fulfillment, as there is no other way. This is powerfully illustrated by the story of Das Ganu in Chapter 22, where Baba manifests the holy rivers from his toe, proving his feet are the ultimate object of devotion and a source of miracles greater than any pilgrimage.