This life which you live and have lived, must be lived again by you, and innumerable times more. And there will be nothing new in it, but every pain and every joy and every thought and every sigh— everything unspeakably small and great in your life—must come again to you, and in the same sequence and series – Friedrich Nietzsche, The Eternal Recurrence. The Gay Science (1882), p. 341
A change in something seemingly innocuous, such as a flap of a butterfly’s wings, may have unexpected larger consequences in the future, such as the path a hurricane will travel. If you change even the smallest of life’s details, you completely change its outcome. –The Butterfly Effect. Edward Lorenz.