In the tenth and final book of Plato’s Republic (Stephanus 595–621), with the help of Glaucon, Socrates does three things:
- Confirm and strengthen the ban on imitative poetry carried out in Book III.
- Prove the immortality of the soul.
- Tell the Myth of Er about how best to make use of that immortality.

Bernard Picart
Glaucus Turned into a Sea-God, 1731
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