I built my house on solid ground
Convinced that it was safe and sound
Not thinking that the earth could move
But earthquakes happen just to prove
No ground can ever be secure -
My house fell down and is no more.

Beneath the surface, nothing's fixed
As with the rocks our fate is mixed
And everything can surely break -
There's nothing that the earth can't shake
No walls forever stay erect
And all that's joined can disconnect

Valerie Dohren

http://www.poemhunter.com/poem/solid-ground-6/