The Myth of Er is the conclusion of Plato's Republic. However, it could be considered as a standalone text that refers to the fundamental philosophical question that has always concerned all humans, in every era.
Where does our soul go when we die and where does it come from when we are born?
In order to provide an informed answer that could lead to a safe conclusion, Socrates connects the journey of our soul with the functioning of our planetary system and attempts to analyze a series of related mystical and scientific topics:
-What is the difference between an evolved soul and an evolved mind?
-Why is the cultivation of virtues necessary?
-What is the tristratos of Hades and its relationship with the "Van Allen belts"?
-How are the punishments and rewards of our soul determined?
-Where is Tartarus located?
-What does the symbol of the Chariot of Necessity represent?
-How is the functioning of spacetime related to the "Kuiper belt"?
-What does the existence of the Sirens and the three Fates signify?
-What is the process of our incarnation?
-What is the contract that we sign before incarnating on planet Earth?
-What is the role of Free Will?
-What does the mystery of Dionysian theater symbolize?
-How does reincarnation differ from transmigration?
-What is Socrates' daemon or our guardian angel?
How can we ultimately save our soul.