What qualities does Chapter 21 say make a spiritual narration powerful and effective?

According to the beginning of Chapter 21, a spiritual narration is only truly effective if it evokes a deep, visceral response from the listener. The author states that a speaker's words are wasted if the listener "does not sway upon hearing them" or if "the hair on the body does not stand on end." The text 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 emphasizes that the goal of such stories is not just to convey information but to create a profound emotional and spiritual experience.