It's so rare to know you're happy in the moment you are happy.
It's so rare, and the trick is not to tell yourself how rare it is, but to enjoy it, and not worry about its impermanence, about having to hang on so tightly. Instead, just tell yourself you're happy and watch, in amazement, the simple truth of that statement.
When it goes, it goes. But impermanence doesn't mean easily lost. It slips away, but it always comes back.
That, after all, is the nature of all things circular.