There is obviously a great immaturity and uncertainty in all these outpourings, an intensity and effervescence of emotion out of proportion as yet both to the intellectual and the voluntary powers, much confusion of idea, and not a little of expression. Yet even in this first book of Keats there is much that the lover of poetry will always cherish. Literature, indeed, hardly affords another example of work at once so crude and so attractive. Passages that go to pieces under criticism nevertheless have about them a spirit of beauty and of morning, an abounding young vitality and freshness, that exhilarate and charm us whether with the sanction of our judgment or without it. And alike at its best and worst, the work proceeds manifestly from a spontaneous and intense poetic impulse. The matter of these early poems of Keats is as fresh and unconventional as their form, springing directly from the native poignancy of his sensations and abundance of his fancy. That his inexperience should always make the most discreet use of its freedom could not be expected; but with all its immaturity his work has strokes already which suggest comparison with the great names of literature. Who much exceeds him, even from the first, but Shakspere in momentary felicity of touch for nature, and in that charm of morning freshness who but Chaucer? Already, too, we find him showing signs of that capacity for clear and sane self-knowledge which becomes by-and-by so admirable in him. And he has already begun to meditate to good purpose on the aims and methods of his art. He has grasped and vehemently asserts the principle that poetry should not strive to enforce particular doctrines, that it should not contend in the field of reason, but that its proper organ is the imagination, and its aim the creation of beauty. With reference to the theory and practice of the poetic art the piece called _Sleep and Poetry_ contains one passage which has become classically familiar to all readers. Often as it has been quoted elsewhere, it must be quoted again here, as indispensable to the understanding of the literary atmosphere in which Keats lived:--