Rass

We get sad when something that we got happy about stops existing. So you might say that sadness is a testament from happiness. If u think that happiness is something that exists, it can also stop existing and therefore leave something behind which seems to be sadness most of the time. But what if we get it around our heads that happiness is just a simple skill which we can learn an adapt to our normal life, we would never lose it, but just forget it. The trick is just every time your sad you have to remind your self that you haven't lost anything, just forgotten something.