History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
whereas now, as we have just shown, your practices are old-fashioned as compared with theirs.
But in politics, as in the arts, the new must always prevail over the old. It is true that when a state is at peace the established practices are best left unmodified, but when men are compelled to enter into many undertakings there is need of much improvement in method. It is for this reason that the government of the Athenians, because they have undertaken many things, has undergone greater change than yours.