All words, then, belonging to the inner world of the mind, are of the imagination, are originally poetic words. The better, however, any such word is fitted for the needs of humanity, the sooner it loses its poetic aspect by commonness of use. It ceases to be heard as a symbol, and appears only as a sign. Thus thousands of words which were originally poetic words owing their existence to the imagination, lose their vitality, and harden into mummies of prose. Not merely in literature does poetry come first, and prose afterwards, but poetry is the source of all the language that belongs to the inner world, whether it be of passion or of metaphysics, of psychology or of aspiration. No poetry comes by the elevation of prose; but the half of prose comes by the “massing into the common clay” of thousands of winged words, whence, like the lovely shells of by-gone ages, one is occasionally disinterred by some lover of speech, and held up to the light to show the play of colour in its manifold laminations. For the world is--allow us the homely figure--the human being turned inside out. All that moves in the mind is symbolized in Nature. Or, to use another more philosophical, and certainly not less poetic figure, the world is a sensuous analysis of humanity, and hence an inexhaustible wardrobe for the clothing of human thought. Take any word expressive of emotion--take the word _emotion_ itself--and you will find that its primary meaning is of the outer world. In the swaying of the woods, in the unrest of the “wavy plain,” the imagination saw the picture of a well-known condition of the human mind; and hence the word _emotion_. [Footnote: This passage contains only a repetition of what is far better said in the preceding extract from Carlyle, but it was written before we had read (if reviewers may be allowed to confess such ignorance) the book from which that extract is taken.] But while the imagination of man has thus the divine function of putting thought into form, it has a duty altogether human, which is paramount to that function--the duty, namely, which springs from his immediate relation to the Father, that of following and finding out the divine imagination in whose image it was made. To do this, the man must watch its signs, its manifestations. He must contemplate what the Hebrew poets call the works of His hands.