Quote from : Leviathan Book

So that in the nature of man, we find three principal causes of quarrel: First, Competition; Secondly, Dissidence; Thirdly, Glory. The first, maketh men invade for Gain; the second, for Safety; and the third, for Reputation. The first use Violence, to make themselves Masters of other men's persons, wives, children and cattle; the second, to defend them; the third, for trifles, as a word, a smile, a different opinion, and any other sign of undervalue, either direct in their Persons, or by reflexion in their Kindred, their Friends, their Nation, their Profession, or their Name.