Happiness* is a *fickle friend It comes unexpectedly, though usually with reason and leaves much too soon. It has never confined itself to our time, never regular and always fleeting. It's quite sad.
at least periods are somewhat regular, though they never bring joy and only seem to tell you that you're not pregnant.
Funny, though, isn't it? How things that bring us pain (emotional and physical) are regular visitors compared to Happiness everyone's fickle friend.