Answer:
I am not alive, though I never die, to no one I've ever told a lie, today I can be god's warrior, and serve him with no horror, but tomorrow I might be devil's knight, for I am what ends the light.
What cleans as it gets dirty only to get clean the more you use it?
What can you hold in your left hand but can never hold in your right hand?
What freezes after it is heated up?
What comes down but never back goes up?
When someone uses this acronym, you know you've got to pick up the pace