According to Chapter 28, what is the fundamental nature of Sai, and how does this relate to the qualities of a Sadguru?

Chapter 28 explains that Sai is not separate from anyone and dwells in all beings, pervading everything from Brahma to the smallest insect. This omnipresence is a key aspect of His nature. The text further elaborates on the qualities of a Sadguru, stating that Sai is proficient in both Shabda-Brahma (the divine word) and Para-Brahman (Supreme Being). A Sadguru is defined as one who can impart teachings and is established in their own true nature. As the chapter notes, a Guru's compassion is highlighted as being greater than a father's, for while a father gives birth to a body subject to death, the Guru has the power to remove the entire cycle of birth and death for the disciple.