From the Porch's murky depths Comes a doctrine sage, That doth liken living mind To a written page; Since all knowledge comes through Sense, Graven by Experience. 'As,' say they, 'the pen its marks Curiously doth trace On the smooth unsullied white Of the paper's face, So do outer things impress Images on consciousness.' But if verily the mind Thus all passive lies; If no living power within Its own force supplies; If it but reflect again, Like a glass, things false and vain-- Whence the wondrous faculty That perceives and knows, That in one fair ordered scheme Doth the world dispose; Grasps each whole that Sense presents, Or breaks into elements? So divides and recombines, And in changeful wise Now to low descends, and now To the height doth rise; Last in inward swift review Strictly sifts the false and true? Of these ample potencies Fitter cause, I ween, Were Mind's self than marks impressed By the outer scene. Yet the body through the sense Stirs the soul's intelligence. When light flashes on the eye, Or sound strikes the ear, Mind aroused to due response Makes the message clear; And the dumb external signs With the hidden forms combines. FOOTNOTES: [R] A criticism of the doctrine of the mind as a blank sheet of paper on which experience writes, as held by the Stoics in anticipation of Locke. See Zeller, 'Stoics, Epicureans, and Sceptics,' Reichel's translation, p. 76. V.