How does Chapter 4 describe the mission of a saint and their ultimate divine nature, particularly in relation to Sai Baba?

Chapter 4 outlines that a saint's mission is to perform the work of religion and awaken faith. They are said to build the temple of Ultimate Truth on the foundation of Renunciation (Nivritti) while using Worldly Activity (Pravritti) to uplift devotees. Once this specific work is done, they end their incarnation. The chapter then elevates this concept by equating Sai with the Supreme Divinity, describing Him as the Inner Self, the Supreme God, and Shankar. This divine being is portrayed as eternal, non-dual, and beyond all limitations, so vast that even the Vedas could not describe Him, resorting to the phrase 'Not this, Not this' (Neti-Neti).