Describe the essential nature of a saint and how Sai Baba is portrayed as the ultimate divine example in Chapter 4.

Chapter 4 of the Shri Sai Satcharitra defines the essential nature of a saint as someone who is naturally liberated yet is always ready to uplift the distressed. Their incarnation is purely for the benefit of others, devoid of any self-interest. The chapter then presents Sai Baba as the supreme manifestation of this divine principle, equating Him with the Supreme God, the Guru, and the Inner Self who brings joy to the world. He is portrayed as eternal, non-dual, and beyond all human comprehension and description. The text notes that the four levels of speech get tired of describing Him, underscoring His ultimate, transcendent divinity.