“Mankind achieved civilisation by developing and learning to follow rules (first in territorial tribes and then over broader reaches) that often forbade him to do what his instincts demanded, and no longer depended on a common perception of events. These rules, in effect constituting a new and different morality, and to which I would indeed prefer to confine the term ‘morality’, suppress or restrain the ‘natural morality’, i.e., those instincts that welded together the small group and secured cooperation within it at the cost of hindering or blocking its expansion.”