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?

Let us dismiss, as irrelevant to the poem, per se, the circumstance- or say the necessity- which, in the first place, gave rise to the intention of composing a poem that should suit at once the popular and the critical taste.
We commence, then, with this intention.

The initial consideration was that of extent. If any literary work is too long to be read at one sitting, we must be content to dispense with the immensely important effect derivable from unity of impression- for, if two sittings be required, the affairs of the world interfere, and everything like totality is at once destroyed. But since, ceteris paribus, no poet can afford to dispense with anything that may advance his design, it but remains to be seen whether there is, in extent, any advantage to counterbalance the loss of unity which attends it. Here I say no, at once. What we term a long poem is, in fact, merely a succession of brief ones- that is to say, of brief poetical effects. It is needless to demonstrate that a poem is such only inasmuch as it intensely excites, by elevating the soul; and all intense excitements are, through a psychal necessity, brief. For this reason, at least, one-half of the "Paradise Lost" is essentially prose- a succession of poetical excitements interspersed, inevitably, with corresponding depressions- the whole being deprived, through the extremeness of its length, of the vastly important artistic element, totality, or unity of effect.

It appears evident, then, that there is a distinct limit, as regards length, to all works of literary art- the limit of a single sitting- and that, although in certain classes of prose composition, such as "Robinson Crusoe" (demanding no unity), this limit may be advantageously overpassed, it can never properly be overpassed in a poem. Within this limit, the extent of a poem may be made to bear mathematical relation to its merit- in other words, to the excitement or elevation-again, in other words, to the degree of the true poetical effect which it is capable of inducing; for it is clear that the brevity must be in direct ratio of the intensity of the intended effect- this, with one proviso- that a certain degree of duration is absolutely requisite for the production of any effect at all.

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