" As the king governs by his executive, so Reason in man must rule the mere appetites by means of the "spirited element." The head rules the belly through the chest -- the seat, as Alanus tells us, of Magnanimity, of emotions organized by trained habit into stable sentiments. The Chest-Magnanimity-Sentiment -- these are the indispensable liaison officers between cerebral man and visceral man. It may even be said that it is by the middle element that man is man: for by his intellect he is mere spirit and by his appetite he is mere animal. "

― C.S. Lewis , The Abolition of Man