In the night I feel it there
The darkness in my heart
It's beating gives me quite a scare
It's tearing me apart
Joseph Conrad's book was right
True evil lies within
Our hearts are all as dark as night
Filled up with pain and sin
So I just lie there in my bed
In my quiet misery
The darkness creeping towards my head
I will never be free
Florence P. Wordsmith
http://www.poemhunter.com/poem/the-dark-side-of-the-heart/