How does the beginning of Chapter 21 describe the qualities of an effective narration and Sai Baba's unique style?

The introduction to Chapter 21 reflects on what makes a spiritual narration powerful. It states that a speaker's words are in vain if the listener does not sway upon hearing them or if their hair does not stand on end. A narration is considered futile if it fails to delight the listeners, cause their throats to choke with emotion, or bring tears of love and joy to their eyes. In this context, as described in Chapter 21, Sai Baba’s own communication is highly praised; His speech is called captivating, His method of instruction extraordinary, and His actions at every step are described as innovative.