One of the earliest known personality theories is the ‘Bodily Humors Theory’ by Claudius Galenus. He lived from 129 AD until approximately 200-216 AD. His way of thinking was primarily influenced by humorism, which was Hippocrates’ theory that the human body was filled with 4 bodily fluids, collectively called humors. Those four were blood, phlegm, yellow bile and black bile. Any excess or deficit of one of these four fluids was thought to have influences on someone’s physical or psychological well-being. What was new was that Galenus linked these fluids to combinations of four base-qualities, warm, cold, dry and moist, which in turn were thought to have an influence on your temperament characteristics. Which temperament are you?
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