I once was an open village.
Then a bit of pain came into my life, so I built a small wall.
But still pain came in so I built a bigger wall.
But the pain still came in so I built a castle.
But it still came in so I built a castle with a moat.
But it still came in. So I built a bigger and bigger castle till I now have a fortress.

But now I am trapped inside with all this pain so now I have to knock down all these walls.
So I can enjoy life again.