... In considering the total contribution of metre to imaginative language, it is impossible to overlook the quality of _permanence_. I do not mean permanence merely in the sense that metrical words live in the memory.... This is, of course, a most important fact; but I am here dealing only with elements of effect that enter into the actual moment of enjoyment.... It is a sense of combined parts, and their indispensableness one to another, which gives us a sense of permanence in an arch as compared with a casual heap of stones; it is a similar indispensableness which gives to metrical language an air of permanence impossible even to the most harmonious sentence whose sounds conform to no genuine scheme. And again, in the case of this constituent as of the others, we have no difficulty in seeing that its influence is really a joint one of sound and sense--that, though founded in the nature of metrical sound as such, it is not merely a sound-quality superposed _ab extra_ on the intelligible beauty of the words, but depends for its existence on their intelligible character.... We cannot glory in the enshrining for memory of things that we do not care to remember. But for that which is of true spiritual significance the fairly-fitted body of sound is greeted as the inevitable investiture; and thus justified and quickened, the strength of the mutually indispensable parts seems no longer that of mere structure but of organic life. (EDMUND GURNEY: Essay on "Poets, Critics, and Class-Lists," in _Tertium Quid_, vol. ii. pp. 162-179, _passim_.) Why have poets always written in metre? The answer is, Because the laws of artistic expression oblige them to do so. When the poet has been inspired from without in the way in which we saw Scott was inspired to conceive the _Lay of the Last Minstrel_--that is to say, when he has found his subject-matter in an idea, universally striking to the imagination, when he has received this into his own imagination, and has given it a new and beautiful form of life there, then he will seek to express his conception through a vehicle of language harmonizing with his own feelings and the nature of the subject, and this kind of language is called verse. For example, when Marlowe wishes to represent the emotions of Faustus, after he has called up the phantom of Helen of Troy, it is plain that some very rapturous form of expression is needed to convey an adequate idea of such famous beauty. Marlowe rises to the occasion in those "mighty lines" of his: "Was this the face that launched a thousand ships, And burned the topless towers of Ilium?" But it is certain that he could only have ventured on the sublime audacity of saying that a face launched ships and burned towers by escaping from the limits of ordinary language, and conveying his metaphor through the harmonious and ecstatic movements of rhythm and metre....