Who Am I?

I do all work yet jobless
I go all the way though at a place
Most expensive but too cheap
No rest or break, though get all the sleep
Useless, but of utmost importance
No care shown, all the love given
I know all but start from the unknown
Do all changes and no changes still!
The space, freedom to give
And no spare to leave
They all at ease no other more at peace.