[Footnote 2: I here use the word "Poetry" (though against my own judgment) as opposed to the word Prose, and synonomous with metrical composition. But much confusion has been introduced into criticism by this contradistinction of Poetry and Prose, instead of the more philosophical one of Poetry and Science. The only strict antithesis to Prose is Metre.]
If it be affirmed that rhyme and metrical arrangement of themselves constitute a distinction which overturns what I have been saying on the strict affinity of metrical language with that of prose, and paves the way for other distinctions which the mind voluntarily admits, I answer that the distinction of rhyme and metre is regular and uniform, and not, like that which is produced by what is usually called poetic diction, arbitrary and subject to infinite caprices upon which no calculation whatever can be made. In the one case the Reader is utterly at the mercy of the Poet respecting what imagery or diction he may choose to connect with the passion, whereas in the other the metre obeys certain laws, to which the Poet and Reader both willingly submit because they are certain, and because no interference is made by them with the passion but such as the concurring testimony of ages has shewn to heighten and improve the pleasure which co-exists with it. It will now be proper to answer an obvious question, namely, why, professing these opinions have I written in verse? To this in the first place I reply, because, however I may have restricted myself, there is still left open to me what confessedly constitutes the most valuable object of all writing whether in prose or verse, the great and universal passions of men, the most general and interesting of their occupations, and the entire world of nature, from which I am at liberty to supply myself with endless combinations of forms and imagery. Now, granting for a moment that whatever is interesting in these objects may be as vividly described in prose, why am I to be condemned if to such description I have endeavoured to superadd the charm which by the consent of all nations is acknowledged to exist in metrical language? To this it will be answered, that a very small part of the pleasure given by Poetry depends upon the metre, and that it is injudicious to write in metre unless it be accompanied with the other artificial distinctions of style with which metre is usually accompanied, and that by such deviation more will be lost from the shock which will be thereby given to the Reader's associations than will be counterbalanced by any pleasure which he can derive from the general power of numbers. In answer to those who thus contend for the necessity of accompanying metre with certain appropriate colours of style in order to the accomplishment of its appropriate end, and who also, in my opinion, greatly under-rate the power of metre in itself, it might perhaps be almost sufficient to observe that poems are extant, written upon more humble subjects, and in a more naked and simple style than what I have aimed at, which poems have continued to give pleasure from generation to generation. Now, if nakedness and simplicity be a defect, the fact here mentioned affords a strong presumption that poems somewhat less naked and simple are capable of affording pleasure at the present day; and all that I am now attempting is to justify myself for having written under the impression of this belief.
But I might point out various causes why, when the style is manly, and the subject of some importance, words metrically arranged will long continue to impart such a pleasure to mankind as he who is sensible of the extent of that pleasure will be desirous to impart. The end of Poetry is to produce excitement in coexistence with an overbalance of pleasure. Now, by the supposition, excitement is an unusual and irregular state of the mind; ideas and feelings do not in that state succeed each other in accustomed order. But if the words by which this excitement is produced are in themselves powerful, or the images and feelings have an undue proportion of pain connected with them, there is some danger that the excitement may be carried beyond its proper bounds. Now the co-presence of something regular, something to which the mind has been accustomed when in an unexcited or a less excited state, cannot but have great efficacy in tempering and restraining the passion by an intertexture of ordinary feeling. This may be illustrated by appealing to the Reader's own experience of the reluctance with which he comes to the re-perusal of the distressful parts of Clarissa Harlowe, or the Gamester. While Shakespeare's writings, in the most pathetic scenes, never act upon us as pathetic beyond the bounds of pleasure – an effect which is in a great degree to be ascribed to small, but continual and regular impulses of pleasurable surprise from the metrical arrangement. – On the other hand (what it must be allowed will much more frequently happen) if the Poet's words should be incommensurate with the passion, and inadequate to raise the Reader to a height of desirable excitement, then, (unless the Poet's choice of his metre has been grossly injudicious) in the feelings of pleasure which the Reader has been accustomed to connect with metre in general, and in the feeling, whether chearful or melancholy, which he has been accustomed to connect with that particular movement of metre, there will be found something which will greatly contribute to impart passion to the words, and to effect the complex end which the Poet proposes to himself.
If I had undertaken a systematic defence of the theory upon which these poems are written, it would have been my duty to develope the various causes upon which the pleasure received from metrical language depends. Among the chief of these causes is to be reckoned a principle which must be well known to those who have made any of the Arts the object of accurate reflection; I mean the pleasure which the mind derives from the perception of similitude in dissimilitude. This principle is the great spring of the activity of our minds and their chief feeder. From this principle the direction of the sexual appetite, and all the passions connected with it take their origin: It is the life of our ordinary conversation; and upon the accuracy with which similitude in dissimilitude, and dissimilitude in similitude are perceived, depend our taste and our moral feelings. It would not have been a useless employment to have applied this principle to the consideration of metre, and to have shewn that metre is hence enabled to afford much pleasure, and to have pointed out in what manner that pleasure is produced. But my limits will not permit me to enter upon this subject, and I must content myself with a general summary.
I have said that Poetry is the spontaneous overflow of powerful feelings: it takes its origin from emotion recollected in tranquillity: the emotion is contemplated till by a species of reaction the tranquillity gradually disappears, and an emotion, similar to that which was before the subject of contemplation, is gradually produced, and does itself actually exist in the mind. In this mood successful composition generally begins, and in a mood similar to this it is carried on; but the emotion, of whatever kind and in whatever degree, from various causes is qualified by various pleasures, so that in describing any passions whatsoever, which are voluntarily described, the mind will upon the whole be in a state of enjoyment. Now if Nature be thus cautious in preserving in a state of enjoyment a being thus employed, the Poet ought to profit by the lesson thus held forth to him, and ought especially to take care, that whatever passions he communicates to his Reader, those passions, if his Reader's mind be sound and vigorous, should always be accompanied with an overbalance of pleasure. Now the music of harmonious metrical language, the sense of difficulty overcome, and the blind association of pleasure which has been previously received from works of rhyme or metre of the same or similar construction, all these imperceptibly make up a complex feeling of delight, which is of the most important use in tempering the painful feeling which will always be found intermingled with powerful descriptions of the deeper passions. This effect is always produced in pathetic and impassioned poetry; while in lighter compositions the ease and gracefulness with which the Poet manages his numbers are themselves confessedly a principal source of the gratification of the Reader. I might perhaps include all which it is necessary to say upon this subject by affirming what few persons will deny, that of two descriptions either of passions, manners, or characters, each of them equally well executed, the one in prose and the other in verse, the verse will be read a hundred times where