According to the beginning of Chapter 21, what is the desired effect of a spiritual narration on the listener, and how does the author describe Baba's teachings?

The introduction to Chapter 21 emphasizes the profound impact a spiritual story should have on its audience. It suggests that a narration is futile if the listener is not delighted, if their throat does not choke up with emotion, and if tears of love and joy do not flow from their eyes. The text even states that the listener's hair should stand on end. Following this, the author praises Sai Baba's unique abilities as a teacher. As described in Chapter 21, Baba's speech is captivating, His method of instruction is extraordinary, and His actions at every step are innovative, prompting the author to bow at His feet.