You can be a thorough-going Neo-Darwinian without imagination, metaphysics, poetry, conscience, or decency. For 'Natural Selection' has no moral significance: it deals with that part of evolution which has no purpose, no intelligence, and might more appropriately be called accidental selection, or better still, Unnatural Selection, since nothing is more unnatural than an accident. If it could be proved that the whole universe had been produced by such Selection, only fools and rascals could bear to live.
I take as metaphysical poetry that in which what is ordinarily apprehensible only by thought is brought within the grasp of feeling, or that in which what is ordinarily only felt is transformed into thought without ceasing to be feeling.
A poet is a bird of unearthly excellence, who escapes from his celestial realm arrives in this world warbling. If we do not cherish him, he spreads his wings and flies back into his homeland.
At times it has been doubtful to me if Emerson really knows or feels what Poetry is at its highest, as in the Bible, for instance, or Homer or Shakspeare. I see he covertly or plainly likes best superb verbal polish, or something old or odd
What a poem means is as much what it means to others as what it means to the author; and indeed, in the course of time a poet may become merely reader in respect to his own works, forgetting his original meaning.