How does Chapter 4 describe Sai's identity as the Supreme Divinity, and what limitations does it mention in trying to comprehend this divinity?

Chapter 4 elevates Sai to the status of the Supreme Divinity, identifying Him as the Inner Self, the Supreme God, the Guru, and the "Joy-giving Shankar." This divine being is described as the object of ultimate love, eternal, and non-dual. The chapter stresses that He is beyond all limitations, knowing no division of place, time, or object. The text highlights the profound difficulty in comprehending this divinity by stating that the four levels of speech—Para, Pashyanti, Madhyama, and Vaikhari—get tired of describing Him. Even the Vedas, in their attempt to define Him, ultimately failed and resorted to the expression "Not this, Not this" (Neti-Neti), signifying His limitless and indescribable nature.