A passion, therefore, consists not in being affected by the sights which are presented to us, but in giving way to our feelings and following up these chance promptings: for whoever imagines that paleness, bursting into tears, lustful feelings, deep sighs, sudden flashes of the eyes, and so forth, are signs of passion and betray the state of the mind, is mistaken, and does not understand that these are merely impulses of the body.
