Look at the expanse: look backwards, look forwards, look to all dimensions at what you are, what your life is. It looks like a long dream, and everything that you take so seriously this moment becomes useless the next moment.
Remember your first love, how serious it was. Life depended on it. Now you don't remember it at all, it is forgotten. And whatsoever you are thinking that your life depends on today will be forgotten. Life is a flux, nothing remains. It is like a moving film, everything changing into everything else. But in the moment you feel it is very serious, and you get disturbed. This technique says, "This so-called universe appears as a juggling, a picture show. To be happy, look upon it so."