What does the author of Sai Satcharitra say about the qualities of a good story and an attentive listener in Chapter 21?

In the beginning of Chapter 21, the author reflects on the dynamic between a storyteller and the audience. He posits that a speaker's words are in vain if the listener does not experience a deep emotional and physical reaction, such as swaying upon hearing them or having the hair on their body stand on end. The chapter states that narrations are considered futile if the listeners are not delighted, if their throats do not choke up with emotion, and if tears of love and joy do not flow from their eyes. This passage in Chapter 21 emphasizes the profound, transformative power that spiritual stories, particularly those about Sai Baba whose speech is described as captivating, should have on an individual.