I hold that a long poem does not exist. I maintain that the phrase, "a long poem," is simply a flat contradiction in terms.
But all excitements are, through a psychal necessity, transient. That degree of excitement which would entitle a poem to be so called at all, cannot be sustained throughout a composition of any great length. After the lapse of half an hour, at the very utmost, it flags- fails- a revulsion ensues- and then the poem is, in effect and in fact, no longer such.
On the other hand, it is clear that a poem may be improperly brief. Undue brevity degenerates into mere epigrammatism. A very short poem, while now and then producing a brilliant or vivid, never produces a profound or enduring effect.