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The Czech novelist Milan Kundera coined the phrase “the lightness of being” in 1984’s The Unbearable Lightness of Being. He meant it as a counterpoint to “the heaviest of burdens,” Nietzsche’s idea of eternal return: “If every second of our lives recurs an infinite number of times, we are nailed to eternity as Jesus was nailed to the cross,” he wrote. “It is a terrifying prospect. In the world of eternal return the weight of unbearable responsibility lies heavy on every move we make.”