According to the introduction of Chapter 21, what are the signs of an effective and successful spiritual narration?

The beginning of Chapter 21 sets a high standard for spiritual storytelling. It posits that a speaker's words are in vain unless they produce a profound effect on the listener. The specific signs of a successful narration mentioned in this chapter include the listener swaying upon hearing the words and the hair on their body standing on end. Furthermore, the chapter describes narrations as "futile" if they fail to delight the listeners, cause their throats to choke up with emotion, and bring tears of love and joy to their eyes. This perspective, detailed in Chapter 21, emphasizes that true spiritual discourse is not merely informational but deeply transformational and emotionally resonant, much like Baba's own captivating speech.