How does the introduction of Chapter 21 describe the ideal effect of spiritual narration on its audience?

The beginning of Chapter 21 sets a high standard for spiritual storytelling and its reception. It posits that a speaker's words have gone to waste if the listener does not emotionally react, specifically by swaying upon hearing them or feeling the hair on their body stand on end. The chapter describes narrations as futile if they fail to delight the listeners, cause their throats to choke up with emotion, or bring tears of love and joy to their eyes. This ideal interaction underscores the transformative power that such stories are meant to have on the devoted listener.