Men are not gentle creatures who want to be loved...; they are, on the contrary, creatures among whose instinctual endowments is to be reckoned a powerful share of aggressiveness.
The first requisite of civilization, therefore, is that of justice--that is, the assurance that a law once made will not be broken in favor of an individual.
The inclination to aggression is an original, self-subsisting instinctual disposition in man, and…it constitutes the greatest impediment to civilization.