Answer:
I'm sometimes white and always wrong. I can break a heart and hurt the strong. I can build love or tear it down. I can make a smile or bring a frown.
White bird, featherless, flying out of paradise. Flying over sea and land. Dying in my hand.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.
What has one eye but cannot see?
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Brings the sky a lot closer.