"A skillful literary artist has constructed a tale. If wise, he has not fashioned his thoughts to accommodate his incidents; but having conceived, with deliberate care, a certain unique or single effect to be wrought out, he then invents such incidents — he then combines such events as may best aid him in establishing this preconceived effect. If his very initial sentence tend not to the out bringing of this effect, then he has failed in his first step. In the whole composition there should be no word written, of which the tendency, direct or indirect, is not to the one pre-established design. And by such means, with such care and skill, a picture is at length painted which leaves in the mind of him who contemplates it with a kindred art, a sense of the fullest satisfaction. The idea of the tale has been presented unblemished, because undisturbed; and this is an end unattainable by the novel. Undue brevity is just as exceptionable here as in the poem; but undue length is yet more to be avoided." - Poe
In his assertion Poe is explaining what he thinks is the effective way to write a tale. He lists his ideas step by step, for someone to follow when they are creating their own tale. He talks about what one shouldn't do when writing the tale, what is effective or ineffective. If the author uses the steps that Poe is giving they will have a great tale, but if the author does otherwise their story can turn out to be mediocre. He talks about techniques one should use in their tale for the reader to be engaged in the talk being read/told. He instructs how "he" should use diction and imagery to catch the reader and drive the reader to want to reach the end of the tale.
Poe uses rhetorical and literary devices throughout his assertion such as diction, syntax and tone. He uses diction when repeating the words, "he, him, his" a lot through the text. His choice in using "he, him, his" can make the audience wonder what he truly means. Is he talking to a man directly, or is he implying that those who write fables are only men, what is the true meaning to the gender he is putting to a person he intends would write good tales, or is he simply just using "he, him, his?" Another device he uses is syntax, he uses a short sentence then a long sentence, then he just writes in equal medium sentences. Poe's tone throughout the text gives a feeling of his passion and how dedicated he is to writing. He speaks about art with such care, showing how passionate he is, towards writing.