The following quote uses direct address to draw the audience into the story. That is the effect that the quote has on the audience.
This excerpt from "The legend of Carman" is introduced by the verb "Hearken!", which comes from Middle English and means to pay attention to what is being said. Moreover, this quote includes other verbs in the imperative mood ("attend", "hold" and "listen"). The use of the imperative mood implies that the reader is being directly addressed in order to capture his/her attention.