What does Chapter 23 teach about how to perceive a saint and why they incarnate on earth?

According to Chapter 23, one cannot understand the true state of a saint by observing external factors like their caste, their specific behaviors, or what they eat, as their essential nature is always beyond such things. The chapter explains that the incarnations of saints occur on earth out of benevolence, specifically for the salvation of 'dull-witted souls,' which is a grace of the Almighty. It is also mentioned that a desire to hear the stories of saints, which brings happiness and contentment, only arises in the heart of a person who has a store of merit (Punya) from past actions.