Answer:
It comes only before, it comes only after. Rises only in darkness, but rises only in light. It is always the same, but is yet always different.
I am round as a bowl, deep as a tub, but all the world's water couldn't fill me up.
I am mother and father, but never birth or nurse. I'm rarely still, but I never wander.
What flies without wings?
I can run but not walk. Wherever I go, thought follows close behind.
What can you lose that will cause other people to lose theirs too?