Answer:
What is often returned, but never borrowed/
They belong to me; they belong to you; They can make you feel happy or make you feel blue; They never end until the day you do.
I can travel from there to here by disappearing, and here to there by reappearing.
Held firmly in the hands, like a sword it cuts deep. Bloodless strokes, all, then forward we leap.
I have one door and five rooms what am i
You use it between your head and your toes, the more it works the thinner it grows.