Answer:
I'm the source of all emotion, but I'm caged in a white prison.
It is more feared than fear itself, And no one can escape it. It takes no sides and does not judge, it does not know to hold a grudge. It is the most clearest result, Of how life beats you by default.
What goes around and around the wood, but never goes into the wood?
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around.
Metal or bone I may be, many teeth I have and always bared. Yet my bite harms no one. And ladies delight in my touch.
When is it bad luck to see a black cat?