The Unbearable Lightness of Being...

... refers to the transience of human existence and the sense of existential vertigo that comes from understanding your own mortality and insignificance. It's the realization that the things that matter most to you, the things you lay awake nights agonizing over and tear yourself apart dissecting and debating, are already utterly insignificant to the an overwhelming number of other people and will be totally forgotten when you're dead.

Now only if we all sensed this. The world would be a better place.