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Socrates has now completed the main argument of The Republic; he has defined justice and shown it to be worthwhile. He turns back to the postponed question concerning poetry about human beings. In a surprising move, he banishes poets from the city. He has three reasons for regarding the poets as unwholesome and dangerous. First, they pretend to know all sorts of things, but they really know nothing at all. It is widely considered that they have knowledge of all that they write about, but, in fact, they do not. The things they deal with cannot be known: they are images, far removed from what is most real. By presenting scenes so far removed from the truth poets, pervert souls, turning them away from the most real toward the least.
Worse, the images the poets portray do not imitate the good part of the soul. The rational part of the soul is quiet, stable, and not easy to imitate or understand. Poets imitate the worst parts—the inclinations that make characters easily excitable and colorful. Poetry naturally appeals to the worst parts of souls and arouses, nourishes, and strengthens this base elements while diverting energy from the rational part.
Poetry corrupts even the best souls. It deceives us into sympathizing with those who grieve excessively, who lust inappropriately, who laugh at base things. It even goads us into feeling these base emotions vicariously. We think there is no shame in indulging these emotions because we are indulging them with respect to a fictional character and not with respect to our own lives. But the enjoyment we feel in indulging these emotions in other lives is transferred to our own life. Once these parts of ourselves have been nourished and strengthened in this way, they flourish in us when we are dealing with our own lives. Suddenly we have become the grotesque sorts of people we saw on stage or heard about in epic poetry.
Despite the clear dangers of poetry, Socrates regrets having to banish the poets. He feels the aesthetic sacrifice acutely, and says that he would be happy to allow them back into the city if anyone could present an argument in their defense.
Socrates then outlines a brief proof for the immortality of the soul. Basically, the proof is this: X can only be destroyed by what is bad for X. What is bad for the soul is injustice and other vices. But injustice and other vices obviously do not destroy the soul or tyrants and other such people would not be able to survive for long. So nothing can destroy the soul, and the soul is immortal.
Once Socrates has presented this proof, he is able to lay out his final argument in favor of justice. This argument, based on the myth of Er, appeals to the rewards which the just will receive in the afterlife. According to the myth, a warrior named Er is killed in battle, but does not really die. He is sent to heaven, and made to watch all that happens there so that he can return to earth and report what he saw. He observes an eschatalogical system which rewards virtue, particularly wisdom. For 1000 years, people are either rewarded in heaven or punished in hell for the sins or good deeds of their life. They are then brought together in a common area and made to choose their next life, either animal or human. The life that they choose will determine whether they are rewarded or punished in the next cycle. Only those who were philosophical while alive, including Orpheus who chooses to be reborn as a swan, catch on to the trick of how to choose just lives. Everyone else hurtles between happiness and misery with every cycle.
The definitions on this list are mostly helpful, but the term "Understanding" is incorrect and misleading. The highest grade of cognitive activity in Plato's fourfold epistemological scheme is, in Greek, "noesis." In English this should be called Intellection, Higher Reason, or simply Noesis. To call it Understanding badly confuses things because of the myriad unrelated meanings and senses of "understanding" in English.
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Similarly, what the list above calls "Reason" would be better termed ratiocination, calculation, reasoning, or lower reason. To simply call this faculty Reason confounds two distinct faculties: ratiocination (dianoia) and Higher Reason (nous or Nous). Ratiocination is somewhat like the ability that animals have to think and plan. It is the Higher Reason that is associated with mans immortal soul, and on which basis, according to Plato, man may attain "likeness to God insofar as possible."
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Spouses in the republic are not drawn by lot, as is asserted in the summary for Book V. Rather, they are chosen so that 'bronze-souled' individuals will be paired off with other bronze-souled individuals, and gold-souled with other gold-souled. The idea of the lottery is a lie fabricated by the framers of the city to placate citizens.
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