According to Plato the soul is immortal. It exists before being embodied in this world and exist after the death and undergoes the cycle of rebirths till it succeeds in releasing itself by purifying itself. Plato speaks of two things about the soul. First thing is its dateless anteriority to all things generable and the second thing is its immorality and sovereignty over the world of bodies.
Again , soul is is utterly superior to body, and the body is nothing else but its shadow. But the soul is responsible for its deeds after its death. Further, Plato tells us that soul is immortal and imperishable and will certainly live after death. Each soul has to face judgement. The wicked ones who have cultivated gluttony or selfishness will assume the form of donkeys and other animals. However, those who have lived in purity will enjoy the company of God.
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Plato has separated the soul from body and this has led to the dualism of soul and body, but he has not clarified the relationship between them. Their nature is quite opposed. The soul is immortal; the body is perishable. The soul is simple; the body is composite of the four elements of fire, air, earth and water. In a crude way, Plato has explained the interaction between the body and the soul. The embodied soul has three parts of reason, high spirits and appetites. Reason is near the soul and appetites largely belong to the body.