While the epic mania, while the idea that to merit in poetry prolixity is indispensable, has for some years past been gradually dying out of the public mind, by mere dint of its own absurdity, we find it succeeded by a heresy too palpably false to be long tolerated, but one which, in the brief period it has already endured, may be said to have accomplished more in the corruption of our Poetical Literature than all its other enemies combined. I allude to the heresy of _The Didactic. _It has been assumed, tacitly and avowedly, directly and indirectly, that the ultimate object of all Poetry is Truth. Every poem, it is said, should inculcate a morals and by this moral is the poetical merit of the work to be adjudged. We Americans especially have patronized this happy idea, and we Bostonians very especially have developed it in full. We have taken it into our heads that to write a poem simply for the poem’s sake, and to acknowledge such to have been our design, would be to confess ourselves radically wanting in the true poetic dignity and force:—but the simple fact is that would we but permit ourselves to look into our own souls we should immediately there discover that under the sun there neither exists nor _can _exist any work more thoroughly dignified, more supremely noble, than this very poem, this poem _per se, _this poem which is a poem and nothing more, this poem written solely for the poem’s sake. With as deep a reverence for the True as ever inspired the bosom of man, I would nevertheless limit, in some measure, its modes of inculcation. I would limit to enforce them. I would not enfeeble them by dissipation. The demands of Truth are severe. She has no sympathy with the myrtles. All _that _which is so indispensable in Song is precisely all _that _with which _she _has nothing whatever to do. It is but making her a flaunting paradox to wreathe her in gems and flowers. In enforcing a truth we need severity rather than efflorescence of language. We must be simple, precise, terse. We must be cool, calm, unimpassioned. In a word, we must be in that mood which, as nearly as possible, is the exact converse of the poetical. _He _must be blind indeed who does not perceive the radical and chasmal difference between the truthful and the poetical modes of inculcation. He must be theory-mad beyond redemption who, in spite of these differences, shall still persist in attempting to reconcile the obstinate oils and waters of Poetry and Truth.