Joy is a wonderful thing. It can take your breath away. It can also leave you in a state of shock, but good shock. The joy is joyousness in a state of rapture. What ever that means? It means that joy is good.
pain is a bad thing. It can hurt with no physical reason. Pain is a thing, know one can explain,but everyone knows what it is. Why is that?
in the middle
what is in the middle of JOY & pain? Restlessness. Because we have nothing to hold on to.