Dawn and the darkness of night, only one was and one wasn

Dawn and the darkness of night, only one was and one wasn't!
Whatever you do, whatever you are, whatever became;
In the end, one was and one was not!
No matter what you do or don't do, how you are or aren't, whether you're good or bad,
In any case, there was one and there was none!
No matter how much you run and how much you try, there was still one and there was none!
Even when your soul betrays you, or the last person who knows you leaves; there was still one and there was none!
Whatever you do, in the end, someone will say there was, and someone will say no! There wasn't!