The past is not dead. Indeed, it is often not even past.
Cultural creation... begins where chaos and insecurity end.
We are what we repeatedly do. Excellence, then, is not an act, but a habit.
Civilization begins with order, grows with liberty, and dies with chaos.
So I should say that civilizations begin with religion and stoicism: they end with scepticism and unbelief, and the undisciplined pursuit of individual pleasure. A civilization is born stoic and dies epicurean.
In the end, nothing is lost. Every event, for good or evil, has effects forever.