Can you explain the concept of a saint's "deathlessness" and their role in the world, as described in the text?

The text posits that for someone like Sai Baba, there can be no death because he is eternally pure, enlightened, untainted, and deathless. As Chapter 11 describes, saints like him are formless and changeless, even while appearing to have a body. Their role in the world is likened to the Ganges river flowing to the ocean; on its journey, it cools the suffering, gives life to trees, and quenches thirst. Similarly, the incarnation of saints involves them appearing and disappearing, but through their very conduct, they sanctify the world. They are embodiments of pure bliss and self-knowledge, finding refuge in their own true nature.