Without such experiment, all considerations of this kind remain a game of hypothesis.
Einmal ist keinmal. What happens but once might as well not have happened at all.
History is as light as an individual human life, unbearably light, light as a feather, as dust swirling into the air, as whatever will no longer exist tomorrow."
"The Unbearable Lightness of Being" by Milan Kundera has been a really difficult book to plough through. A mess of love and philosophy, it sometimes has the most poignant moments of clarity that seem to ring so very true.