 Perses, lay these things in your heart  And give heed to Justice, and put violence entirely out of your mind.  This is the law (nomon) that Cronus’ son [i.e., Zeus] has established for human beings:  That fish and beasts and winged birds  eat one another, since Justice is not among them;  but to human beings he has given Justice, which is the best by far. (Hesiod, Works and Days 274–280)