If the spirit of their intercourse were still the same after...

If the spirit of their intercourse were still the same after their coming together as it had been when they were living apart,' Aristotle writes, their association can't really be considered a polis, or political community. 'A polis is not an association for residence on a common site, or for the sake of preventing mutual injustice and easing exchange.' While these conditions are necessary to a polis, they are not sufficient. 'The end and purpose of a polis is the good life, and the institutions of social life are means to that end.