"The state of peace among men living side by side is not the natural state; the natural state is one of war. This does not always mean open hostilities, but at least an unceasing threat of war. A state of peace, therefore, must be established, for in order to be secured against hostility it is not sufficient that hostilities simply not be committed; and, until security is pledged to each by his neighbour (a thing that can only occur in a civil state) , each may treat his neighbour, from who he demands this security, as an enemy."