How does Chapter 4 describe Sai Baba's divine nature and his relationship to the Supreme God?

In Chapter 4, Sai is portrayed as the Supreme Divinity itself. The text states that He who brings joy to the world is the Inner Self and the Supreme God, and that this God is the Guru, who is also the Joy-giving Shankar. This chapter describes Him as eternal, non-dual, and beyond all limitations of place, time, or object. His divine nature is so profound that the four levels of speech—Para, Pashyanti, Madhyama, and Vaikhari—get tired of describing Him, and even the Vedas ultimately resorted to saying 'Not this, Not this' (Neti-Neti).