How does Chapter 4 explain the mission of saints in relation to Renunciation (Nivritti) and Worldly Activity (Pravritti), and how does it describe Sai's ultimate divinity?

In a profound explanation, Chapter 4 states that saints "fill the foundation of Renunciation (Nivritti) and build the temple of Ultimate Truth; Around the frame of Worldly Activity (Pravritti), they easily uplift the devotees." This illustrates their role in bridging the spiritual path with worldly life. The chapter then elevates Sai Baba to the highest divine status, describing Him as the Supreme Divinity and the Inner Self who brings joy to all. He is identified as the Guru and the Joy-giving Shankar, being eternal, non-dual, and beyond limitations of time or space. This chapter concludes that even the Vedas failed to describe Him, resorting to the phrase "Neti-Neti" (Not this, Not this).