Answer:
who do you think you know but sometimes you don't
I never was, am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, To live and breath on this terrestrial ball.
My thunder comes before the lightning. My lightning comes before the clouds. My rain dries all the land it touches.
I can run but not walk. Wherever I go, thought follows close behind.
This only turns over once you have travelled very far. What is it?
You use it between your head and your toes, the more it works the thinner it grows.