Answer:
What is weightless but takes two people to hold it?
With sharp edged wit and pointed poise. It can settle disputes without making a noise.
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.
I'm the source of all emotion, but I'm caged in a white prison.
Pirates put their booty in it.
What is always coming but never arrives?