What does Chapter 23 say about how to recognize a true saint, and what is their purpose for being on earth?

Chapter 23 of the Sai Satcharitra advises that one cannot understand a saint's true state by observing external factors. The text explicitly mentions that their caste, behavior, or what they eat are not reliable indicators, as their inner reality is always beyond such superficial things. The purpose of their incarnations on earth is explained as an act of benevolence and a grace of the Almighty, specifically for the salvation of "dull-witted souls." The chapter suggests that having a desire to hear the stories of saints is itself a sign of possessing merit (Punya) from past deeds, which leads one toward happiness and contentment.