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.
We may climb into the thin and cold realm of pure geometry and lifeless science, or sink into that of sensation. Between these extremes is the equator of life, of thought, or spirit, or poetry,--a narrow belt.
That is what all poets do: they talk to themselves out loud; and the world overhears them. But it's horribly lonely not to hear someone else talk sometimes.
The philosophic mind inclines always to an elaborate life--the life of Goethe or of Leonardo da Vinci; but the life of the poet isintense--the life of Blake or of Dante--taking into its centre the life that surrounds it and flinging it abroad again amid planetary music.