Answer:
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?
You use me between your head and your toes the more I work the thinner I grow.
Where I am there is no south, west, nor east, and weather is not fit for man or beast. What am I?
I move without wings, between silken strings. I leave as you find my substance behind. What am I?
I'm the source of all emotion but I'm caged in a white prison.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.