Both Plato and Aristotle believed in a tripartite human soul
Was that just a coincidence, just a symptom of the attraction that the number three has for the human mind? or is the classification in the one case more similar to the other than might first appear?
In Plato's view, the soul contains an appetite, a spirit, and an intellect. These correspond to the classes in an idealized city, where the appetite corresponds to the ordinary working stiffs, the spirit corresponds to the warriors (sometimes called "guardians"), and the intellect to the philosopher kings (sometimes also, confusingly, called "guardians"). In the world of fantasy, the three levels correspond to Dorothy's friends: where the appetite might be represented by the sentimental tin man, the guardian spirit by the lion, and the intellect by the scarecrow.
What about Aristotle? He wrote of the vegetative soul, the sensitive soul, and the (uniquely) human soul. The vegetative functions of life are simply to take in nutrition, to grow, and to reproduce. An oak tree does all of these. The sensitive soul can feel pleasure or pain, react with desire or aversion, and move themselves accordingly. A squirrel does all of these. The beings we call "animals" possess both the vegetative and the sensitive souls. The uniquely human add on is the intellect. Humans, thus, have three layers.
Setting it out this way it is difficult for me to avoid the impression that Aristotle was just biologicizing what he had learned from Plato. The correspondence is not perfect, but it is striking. I think if Plato had been asked, he would not have objected to the correspondence -- either on the microscopic personal account or in the macroscopic account of a well run city, The common folk are the plant life, growing and reproducing and always in need of pruning. The warriors can do the necessary pruning and can protect the fields from outside foes, as dogs with their two-tiered souls protect human property from foes. The (distinctively human) kings can philosophize, because the top level of their three-tiered souls dominates, and with that as qualification they can plan life for the lower two classes.
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