It is as expedient that a wicked man be punished as that a sick man be cured by a physician; for all chastisement is a kind of medicine.
PlatoO youth or young man, who fancy that you are neglected by the gods, know that if you become worse, you shall go to worse souls, or if better to the better... In every succession of life and death, you will do and suffer what like may fitly suffer at the hands of like. This is the justice of heaven.
Plato