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Date: 1777

"The minds of the negroes are contracted; because slavery destroys all the springs of the soul."

— Raynal, Guillaume Thomas (1713-1796)

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Date: 1780-85; in French, 36 vols. 1749-1788

"Is it difficult to perceive that our ideas originate from our senses alone; that the objects we regard as real existences, are those concerning which the senses uniformly give the same testimony."

— Buffon, Georges Louis Leclerc, comte de (1707-1788)

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Date: 1802

"The brain secretes thought like the liver secretes bile."

— Cabanis, Pierre Jean Georges (1757-1808)

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Date: w. 1761-2, rev. 1773-4, 1805

"J'abandonne mon esprit à tout son libertinage. Je le laisse maître de suivre la première idée sage ou folle qui se présente, comme on voit dans l'allée de Foy nos jeunes dissolus marcher sur les pas d'une courtisane à l'air éventé, au visage riant, à l'oeil vif, au nez retroussé, quitter celle-c...

— Diderot, Denis (1713-1784)

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The Mind is a Metaphor is authored by Brad Pasanek, Assistant Professor of English, University of Virginia.