According to the start of Chapter 21, what makes a spiritual narration truly powerful and effective?

The beginning of Chapter 21 emphasizes that the effectiveness of a spiritual narration lies in its ability to evoke a deep emotional and physical response in the listener. The author suggests that a speaker's words are wasted if the listener doesn't sway upon hearing them or if the hair on their body doesn't stand on end. The text further states that narrations are futile if they do not delight the listeners, cause their throats to choke up with emotion, and bring tears of love and joy to their eyes. This perspective, shared in Chapter 21, highlights that the goal is a profound, heartfelt experience rather than mere intellectual comprehension.