What do you think of my poem?

So here's a poem I wrote a while ago, what do you think of it?:

What Is Sadness?

Sadness is a black, never ending hole
It eats away at everything in its path
Sadness lives in the darkest realms of the world
It works alone
Sadness has no mercy
All it loves to do is destroy
Sadness is a horrible thing
But no one can avoid it