Hello, I'm Giorgia De Filippi I'm 16 and I attend the 3rd year of Liceo Scientifico Banzi in Lecce. 
I would like to talk about Plato's idea of the tripartite division of the soul.
To understand better what I'm going to say, it's important to know that Plato was a philosopher born in the 4th century BC, from an important aristocratic family, and that he is considered one of the most brilliant thinkers, who elaborated a lot of themes, concepts and languages of the philosophy. He interested in al the aspects of it, but he did it with a critical spirit.
Probably his real name was Aristocle and the nickname "Plato" was used to describe his strong constitution.
He knew Socrate and he wrote about him too (because Socrate did not write anything) and he founded Accademia, the biggest cultural institution of the ancient Greek (whose name comes from the place where it arose) : it was a religious association and an important place of study, with a big library and a lot of educational and scientific material too.
Plato believed that every person had the soul divided into 3 parts (which sometimes are in contrast) : rational soul, irascible soul and concupiscible soul; he tought that philosophers, in whom prevalied the rational soul, should govern, that soldiers, who were brave for the prevalence of the irascible soul, should defend the society and at last that common men, in whom there was a prevalence of the concupiscible soul, should provide for the material needs. 
To explain the human condition and the struggle between carnal desire, noble emotions and reason, Plato used the myth of the "winged car": in this allegory there are a car (which represents the man), a white horse (which is good and represents the brave and the irascible soul), a black horse (which is bad and represents the carnal instincts and the concupiscible soul) and a charioteer (who represents the reason).
The struggle is represented by the two horses, in fact the white horse (helped by the charioteer) must submit the black horse to arrive to Iperuranio.
At the end, more the black horse will rebel, more the soul will be concupiscible.
So Plato, saying that, did not deny the strenght of the lower passions, but he believed that the task of the reason was to bring them in the right direction.
Thanks for the attenction