"It is believed that physiognomy is only a simple development of the features already marked out by nature. It is my opinion, however, that in addition to this development, the features come insensibly to be formed and assume their shape from the frequent and habitual expression of certain affections of the soul. These affections are marked on the countenance; nothing is more certain than this; and when they turn into habits, they must leave on it durable impressions."

-- Jean-Jacques Rousseau

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