How is Sai Baba depicted in relation to the concept of Supreme Divinity in the fourth chapter?

Chapter 4 elevates Sai Baba to the status of the Supreme Divinity. It states that He who brings joy to the world is the Inner Self and the Supreme God, identifying Him as the Guru and the joy-giving Shankar. This chapter describes Him as the object of ultimate love, eternal, and non-dual, beyond all limitations of place, time, or object. His essence is so profound that the four levels of speech—Para, Pashyanti, Madhyama, and Vaikhari—get tired of describing Him, and even the Vedas ultimately resort to saying "Not this, Not this" (Neti-Neti) in their attempt to define His limitless nature.