Edgar Allan Poe, The philosophy of composition

Should I start writing immediately, or rather first decide the plot in details? How can I estimate the proper length? How can I handle the impressions I'd like to convey?

"Prophet!" said I, "thing of evil! prophet still if bird or devil!
By that Heaven that bends above us- by that God we both adore,
Tell this soul with sorrow laden, if, within the distant Aidenn,
It shall clasp a sainted maiden whom the angels name Lenore-
Clasp a rare and radiant maiden whom the angels name Lenore."
Quoth the Raven- "Nevermore."

I composed this stanza, at this point, first that, by establishing the climax, I might the better vary and graduate, as regards seriousness and importance, the preceding queries of the lover, and secondly, that I might definitely settle the rhythm, the metre, and the length and general arrangement of the stanza, as well as graduate the stanzas which were to precede, so that none of them might surpass this in rhythmical effect. Had I been able in the subsequent composition to construct more vigorous stanzas I should without scruple have purposely enfeebled them so as not to interfere with the climacteric effect.

And here I may as well say a few words of the versification. My first object (as usual) was originality. The extent to which this has been neglected in versification is one of the most unaccountable things in the world. Admitting that there is little possibility of variety in mere rhythm, it is still clear that the possible varieties of metre and stanza are absolutely infinite, and yet, for centuries, no man, in verse, has ever done, or ever seemed to think of doing, an original thing. The fact is that originality (unless in minds of very unusual force) is by no means a matter, as some suppose, of impulse or intuition. In general, to be found, it must be elaborately sought, and although a positive merit of the highest class, demands in its attainment less of invention than negation.

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