What are the characteristics of a powerful spiritual narration and Sai Baba's teaching style as described in the introduction of Chapter 21?

The beginning of Chapter 21 sets a high standard for spiritual storytelling. It suggests that a speaker's words are only effective if the listener is moved to the point where their "hair on the body does not stand on end" and "tears of love and joy do not flow from the eyes." A narration is deemed futile without this emotional and spiritual impact. In this context, the chapter praises Sai Baba's unique methods, describing His speech as "captivating" and His method of instruction as "extraordinary." It also highlights that Baba's actions were innovative at every step, inspiring deep reverence.