The phrase “the Unbearable Lightness of Being” was introduced as the title of a 1984 novel by Milan Kundera. (It also became a movie). It uses Friedrich Nietzsche’s doctrine of the Eternal Return to illustrate Lightness.
The idea of “eternal return,” explains that our universe and our existence, has occurred an infinite number of times in the past, and is cyclical and will continue to occur forever.
This is a heady, intellectual concept, but I’ve been thinking about it lately in terms of how to make sense of the earth (and soul) shattering times we are currently in.
Last year I discovered a new word, liminal, which is also appropriate for these times.