One can look at the same world, which is before our eyes, either from the point of view of its relation to time, or from that of its relationship to eternity. Education means turning the soul in the direction in which it should look, of delivering the soul from the passions. We know that we are acting correctly when the power of thinking is not hindered by what we are doing. To do only those things which one can think clearly, and not to do those things which force the mind to have unclear thoughts about what one is doing. That is the whole of Plato's morality.
True morality is purely internal .
The man who has left the cave annoys the great beast . Intelligence offends by its very nature, thinking annoys the people in the cave. If one stays in the cave, however easily one will be able to observe all the external rules of virtue, one will never be virtuous. Intellectual life and moral life are one. What Plato calls the world of what passes away, these are things in so far as one thinks of them in relation to our passions.