The doctors will treat those of your citizens whose physical and psychological constitution is good: as for the others, they will leave the unhealthy to die and those whose psychological constitution is incurably warped they will be put to death.
For he who would proceed aright... should begin in youth to visit beautiful forms... out of that he should create fair thoughts; and soon he will of himself perceive that the beauty of one form is akin to the beauty of another, and that beauty in every form is one and the same.
We must, if we are to be consistent, and if we re to have a real pedigree herd, mate the best of our men with the best of our women as often as possible, and the inferior men with the inferior women as seldom as possible, and keep only the offspring of the best.
Just as it would be madness to settle on medical treatment for the body of a person by taking an opinion poll of the neighbors, so it is irrational to prescribe for the body politic by polling the opinions of the people at large.
It's like this, I think: the excellence of a good body doesn't make the soul good, but the other way around: the excellence of a good soul makes the body as good as it can be.
If anyone comes to the gates of poetry and expects to become an adequate poet by acquiring expert knowledge of the subject without the Muses' madness, he will fail, and his self-controlled verses will be eclipsed by the poetry of men who have been driven out of their minds.