It is probable then that at the beginning men lived thus, herding together like animals and following the lead of the strongest and bravest, the ruler's strength being here the sole limit to his power and the name we should give his rule being monarchy.
But when in time feelings of sociability and companionship begin to grow in such gatherings of men, then kingship has truck root; and the notions of goodness, justice, and their opposites begin to arise in men.
6.

The manner in which these notions come into being is as follows.

Men being all naturally inclined to sexual intercourse, and the consequence this being the birth of children, whenever one of those who have been reared does not on growing up show gratitude to those who reared him or defend them, but on the contrary takes to speaking ill of them or ill-treating them, it is evident that he will displease and offend those who have been familiar with his parents and have witnessed the care and pains they spent on attending to and feeding their children.

For seeing that men are distinguished from the other animals possessing the faculty of reason, it is obviously improbable that such a difference of conduct should escape them, as it escapes the other animals: they will notice the thing and be displeased at what is going on, looking to the future and reflecting that they may all meet with the same treatment.

Again when a man who has been helped or succored when in danger by another does not show gratitude to his preserver, but even goes to the length of attempting to do him injury, it is clear that those who become aware of it will naturally be displeased and offended by such conduct, sharing the resentment of their injured neighbor and imagining themselves in the same situation.