Based on the text, how does Sai Baba describe his true nature, and why did he take a physical form?

In Chapter 19, Sai Baba explains that his true nature is omnipresent and not confined to any one location or object. He states, "In water, land, wood, and region; among people, in the forest, in the country and abroad; I am pervaded in light and sky." He clarifies that he took on a physical body of "three and a half cubits" for a specific reason: to help devotees overcome the misconception that he is limited to that physical form. This manifestation was an act of grace to make his boundless, pervasive existence more comprehensible and to free his followers from doubt. He further illustrates this non-dual relationship by comparing it to jaggery and its sweetness or the ocean and its waves.