Answer:
With a halo of water and a tongue of wood; stone as skin long I stood.
Light hides me and darkness kills me. What am I?
I have an eye but cannot see. I am fast but I have no limbs. What am I?
What kind of tree can you carry in your hand?
I am born in fear raised in truth and I come to my own in deed. When comes a time that I'm called forth I come to serve the cause of need.
No matter how little or how much you use me, you change me every month.