This one is one which I came up with while listening to a CD of musical scores. Anyhow, I figured this would be a really powerful last line in a tragic poem or story. I plan to use it in one of my own major projects, but I'm sure it won't kill me if I share it here for others to use as well, not that it's all that original:
"Forgive me mother, for I have failed you."
Here are a couple others that i've just come up with now, lol:
What has been demanded has come about
We are the last, and the beginning
"If history is to change, let it change. If the world is to be destroyed, so be it. If my fate is to die, I must simply laugh"