Kitap 5
1307b
And constitutions of all formsare broken up some times from movements initiating from within themselves, but sometimes from outside, when there is an opposite form of constitution either near by or a long way off yet possessed of power. This used to happen in the days of the Athenians and the Spartans; the Athenians used to put down oligarchies everywhere and the Spartans democracies.
1307b
We have then approximately stated the causes that give rise to revolutions in the constitutions of states and to party factions.
