You think that you have felt pain?
Let me tell you what is pain

Pain is when you feel for someone everything
That is not feeling nothing
Pain is to feel the mask on someone smiling
When you see the lie in her eyes

Pain is when you see paining
The man who love the most
To pray again and again
The pain to be stranger and fly like a bird

Pain is to realize reality
Momentary, vanity, your loneliness,
How cheap your friend is shelling you

Yiannis Baki

http://www.poemhunter.com/poem/pain-7/